US1314068A - A corpora - Google Patents

Description

I.. S. LOCKWOOD. DOUBLE TRACKER MUSICAL INSTRUMENT. APPLICATION man JAN. 2o. 191s.

1,814,068. PatentedAug. 26,1919.l

4 SHEETS-SHEET l.

ATTUHNEY- L. S. LOCKWOOD. DOUBLE TRACKER MUSICAL INSTRUMENT.

APPLICATION FILED JAN. 20, 19|6.

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9. mp1@ 00 H 5 m. QA @www D Y 1TH o T QM E 6u N N M Mw R gs u D Mm .Wd T dw T 4 n n FITI.

L. S. LOCKWOOD.

DOUBLE TRACKER MUSICAL INSTRUMENT. APPLICATION FILED IAN.20. IsIs.

Patented Aug. 26, 1919.

4 SHEETS-SHEET 3.

HTTIJR N EYE.

rrm; COLUMBIA' PLANoaR/IPII COI, WASHINGTON. D. c.

L. S. LOCKWOOD.

DOUBLE TRACKER MUSICAL |NSTRUMENT. APPLlcAxoN FILED mazo. |916.

1 ,3 1 4,068'. Patented Aug. 26, 1919.

4 SHEETS-SHEET 4.

d INvENTDR ATTDRNEY 'nu COLUMBIA PLANOGRAPH Co., WASHINGTON, D. c.

UNITED STATES yPATENT OFFICE.

LOUIS s. LOcKwOOD, OF BUFFALO, NEW YORK, AssIGNoR To TIIF RUDOLPH wURLITzFR MANUFACTURING COMPANY, OF NORTH TONAWANDA, NFW YORK, A CORPORA- TION OF NEW YORK.

DOUBLE-TRACKER MUSICAL INSTRUMENT.

Specification of Letters Patent. Patented A110'. 26, 1919.

Application filed January 2o, 191e.` seriai No, 73,150.

T 0 all 'whom t may concern.' y

Be it known that I, LOUIS S. LooKwooD, a. citizen of the United States, residingfat North Tonawanda, in the county of Erie and State of New York, have invented new' and useful Improvements in Double-Tracker Musical Instruments, of which the following is a. specification. v

This invention relates to ardouble-tracker instrument which is especially desirable for moving picture theaters, and more particularly to an instrument of this kind inwhich one or more pipe-stops, such as violin and flute pipes, and other instruments are combined with the piano. k

The object of my invention yis the provision of an efficient and` reliable instrument ofy this character which may be played automatically or manually, with or without the pipe-stops, and which meets various other requirements of theater instruments, such as permitting pieces to be conveniently selected on eithermusic sheet while the other is being played, or one music roll to be changed while the other is being played, and automatically playing the sheets alter'- nately or successively to furnish continuous music, if desired. n

In the accompanying drawings:

Figure 1 is a front elevation of an automatic piano embodying the invention with the front wall of the case removed and the piano action and the strings omitted for clearness. Fig'. 2 is a diagrammatic View showing the roll-driving and controlling mechanism of the two trackers. .FigLS is an enlarged, fragmentary front elevation of he roll-driving mechanism of one of the trackers. Fig. 4f is an end elevation of the same. Fig.' 5 is an enlarged sectional elevation of a set of the controlling pneumatics. Fig. G is a similar view of one of the push buttons and pallets. Fig. 7 is a sectional elevation of the duct-board and pallets and their controlling mechanism. ,Y Figs, 8 and 9 are transverse sections on the correspondingly numbered lines in Fig. 7. Fig. 10 is a fragmentary longitudinal section ofv one of the playing pneumatics. Fig. 11 is ,anl enlargedsectional top plan view of the auxiliary wind chest. Fig. 12 is a fragmentary perspective view thereof, partly in section. Fig. 13 is a fragmentary top plan view, partly in section, of one of the stop-action chests. Fig. 14 is a sectional perspective view of a fragment thereof. Fig. 15 is a transverse section of the manually controlled valve box. Fig. 16 is a transverse vertical section of one of the pipe-wind chests. y

Similar characters of reference indicate corresponding parts throughout the several views., y

1 indicates the main wind chest containing a pneumaticplaying action of any suitable construction, and 2, Fig. 2indicates one of Athe customary striker pneumatics. The wind chest is connected with the usual main suction bellows 3 operated by an electric or other .suitable motor 4:, a trunk connecting the said chest with said bellows. n Y

The instrument contains a. plurality of trackers and associated roll-driving and controlling mechanisms, two being shown in the drawings which are generally designated by the reference letters A and B, respectively. For brevity they are hereinafter referred to as trackers A, B, andbeing identicalv inconstruction, a description of one will apply to both.

G indicates the tracker board, 7 the music roll, 8 the take-up roll, and 9 the music sheet. The take-up roll is engaged with the usual clutch member 10 secured to the takeup shaft 11, while the music roll is engaged by theclutch member 12 secured to the rewind shaft 13, which shafts are journaled in the cheeks 14 of the tracker boxes. The rewind shaft lcarries a spur gear 15 engaging: with an idler 16. `Mounted on the takeup roll shaft 11 is a spur gear `17.

The rolls of each tracker-box preferably have a separate ,driving shaft 1S supported horizontally in the boX. Fixed to this shaft adjacentA to each tracker box is a spur gear' 19 and `pivoted upon the shaft is a vertically movable shifting member or shipperarm20 carrying two transmission gears 21,A

22, which are secured to a spindle 25 journaled in said arm. The gear 21 meshes constantly with the driving gear 19 on the main drive shaft 18. When the arm 20 is lowered, the gear 21 meshes with the rewind idler 16 to rewind the music sheet, while when said arm is raised, the gear 22 meshes with the take-up gear 17 to take up the music sheet.

The driving shafts 1S are preferably position. As shown, these pneumatics-may be combined in a duplex pneumatic having a. single movable board 27 and the arm 2O is connected with said board by a link 26.

A spiral spring 28 shown in Figyl() isa'r-` v ranged inside of these pneumatics and provided with an adjusting screw'29, extending through the stationary board 30. These springs tend to keep the pneumatics in a neutral position in which the transmitting gears 21, 22 are disconnected from both gears 16 and 17. These pneumatics are individually connected with an auxiliary wind chestJ 31 preferably arranged beneath the key table and having, its main suction chamber connected by the trunk 5 with the main suction bellows 3. The take-up or playing pneumatic 23 of tracker A is connected by a conduit 33 with a valve chamber 34 in the auxiliary chest 31 which chamber is connected with the atmosphere by port-s 34"L and with the suction chamber 32 by ports 32al which are controlled by a secondary duplex valve 35 ot ordinary construction. This valve is controlled by a diaphragm 36 located iii the diaphragm chamber 36 to which leads a channel 37 connected with a valve chamber 38 which is connected with the atmosphere by ports 37@l and with the suction chamber 32 by ports 38a. These ports are controlled by a primary or playing valve 39, the heads of which are arranged on the outer side of the chamber 38. This valve is controlled by a. diaphragm 40 covering the diaphragm chamber 40u.

A channel or by-pass 41 provided with the customary bleeds 42, 43 connects the diaphragm chamber 40l with the valve chamber 38. `When the primaryplaying valve 39 is raised by the diaphragm 40, atmosphere passes through the by-pass 41 and acts upon said diaphragm, holding said valve in that position until allowed to drop by the action of the releasing valve hereinafter described. Under these conditions, atmosphere also enters the channel 37 and raises the valve 35, allowing the tension in the chamber 32 to collapse the playing pneumatic 23. Leading to the diaphragm-chamber 40a is a con- .duit 44 which is connected with a duet or channel 47 formed in a. duct-board 46 and having a lateral port 45, as shown in Figs. 7 and 8. This port is controlled by a valve 48 preferably consisting of a spring-pressed pallet, as shown. This pallet is connected by a link 49 with a pneumatic 50.

The valve 39 is lowered or released preferably by the following means:

51 indicates a pouch chamber located in the auxiliary chest 31 and connected by a channel 52 with a valve chamber 53 which 'is connected with the atmosphere by ports 54 and with thesuction chamber 32l byports 55. These ports are controlled by a duplex releasing or stop-valve 56 similar to the val-ve35,---which -inlturn is controlled by a 'p'orts"59`,""60, the port 60 leading directly from the suction chamber 32 to the space inclosed by said pouch, and the port 59 leading to the by-pass 41` Thus by the raising of the releasing valve 56 the pouch chamber 51 is placed in communication with the suction chamber 32 and the pouch 58 is raised from the ports 59 and 60, exhausting the by-pass 41 and allowing the primary playing valve 39 to drop. yThe channel 37 is thereby connected with the suction chamber 32, lowering the secondary valve 35 and cutting oit communication lbetween the suction chamber 32 and the playing pneumatic v2,3, thereby flushing the latter and returning the corresponding shipper arm 20 to neutral position. The releasing diaphragm 57 is connected Iby a conduit 61 with an atmospheric duct 61'a in the valve board 46, to which duct leads a port 61D, controlled by a spring-pressed pallet 61e which normally closes said port. This pallet 6lc is connected by a link 62 with a pneumatic 63.

As shown in Fig. 2, the playing bellows 23 ot tracker B is connected by a conduit 64 with the primary and secondary playing valves 64, 65 in the auxiliary wind chest 31, which valves are identical in construction with the corresponding primary and second.- ary valves 39` 35, of tracker A. The valve 64a is raised bya diaphragm connected by a conduit 66 with a channel 67 in the board 46 from which leads a. port 67a controlled by the pallet 61c and is released by a duplex valve 68, similar to valve 56, in order to raise the secondary valve 65, and flush the playing pneumatic 23 of tracker B, thereby returning the roll-driving mechanism thereor' to neutral or inoperative position and stopping the corresponding music sheet. The diaphragm of the releasing valve 68 is connected by a. conduit 69 with a channel 70 and port 70'DL in the board 46, which port is controlled by the pallet 48.

The pneumatic 50 is connected by a conduit 71 with a valve chamber 72 which communicates with the atmosphere and the suction chamber 32 by ports 74 and 75. These ports are controlled by a duplex valve 76 actuated by a diaphragm 77 to which leads conduit 78 connected with a controlling duct 7 9 of the tracker B. The pneumatic 63 is connected by a conduit 71a with a vvalve chamber similar to the chamber 72 and is controlled by a Valve 76a to thu liaphragm of which leads a conduit 7 8*L connected with a controlling duct 7 9 of the tracker A. It will thus be seen that the playing pneumatic of tracker A is collapsed by the opening of the pallet valve 48 and flushed by the opening of the pallet 61, while the playing pneumatic 23 of tracker B is collapsed by the opening of the pallet 61c and flushed by the opening of the pallet 48.

The rewind pneumatic 24 of tracker A is controlled by primary and secondary rewind valves 81, 82 and a releasing valve 83 similar to the valves 39, 35 and 56 ofthe playing pneumatic 23 of said tracker, 80 indicating the conduit which connects saidl rewind pneumatic with said secondary valve 82, and S1a a conduit which connects said primary valve 81 with achannel 81b and a port S1@ in the duct board 1116. lThis'port is controlled by the pallet 612 The releasing valve S3 is connected by a conduit 83a with a channel 83b and a port 83c in the board 46, which port is controlledby the pallet 4:8. The rewind pneumatic 24 of tracker B is likewise vcontrolled by similar' primary and secondary rewind valves S5, S6, and a releasing valve 89, said pneumatic being connected with the secondary rewind valve 86 by a conduit 841, while said primary valve is connected by a conduit 87 with a channel 88 and a port 88 controlled yby the pallet 48, and the releasing valve 89 is connected by a conduit 90 with a channe191 and a port 91a controlled by the pallet 61B.

By this construction and arrangement of the controlling mechanism, the playing pneumatic 23 of one tracker and the rewind pneumatic 24 of the other tracker are simultaneously collapsed, thus taking up the music sheet of one tracker and at the same time rewinding the sheet of thev other.

rlhe actuation ofthese sets of playing and rewind pneumatics is automatically controlled after the playing of each music sheet byperforations 92 located near the ends of the sheets and ,coperating with controlling ducts 79 of the tracker boards, each board having one of such ducts.V

After a Vsheet has bee-n rewound, its rewind mechanism is automatically stopped by any suitable means. The preferred mecha-,

nism shown in the drawings is constructed as follows: I I

93, Figs. 2, 3 and 1, indicates flushing valves respectively located adjacent to the roll driving mechanisms of the trackers and each consisting of a spring-pressed pallet which normally closes a flushin'gport 93ain a block94f. The port 93a of the tracker A is connected by a conduit 95, channel 83b and conduit 83 with the diaphragm of the releasing valve S3 which controls the rewind pneumatic of tracker A. The port 93L of the tracker B is connectedby conduits 96 and 90 with the corresponding releasing valve 89 of the rewind pneumatic of tracker B.

97 indicates fingers which coperate with the take-up rolls S, respectively, and Control the flushing valves 93. Each of these fingers is pivoted to a rock arm 98 secured to a horizontal rock shaft 99 arranged parallel with the take-up roll and supported in the adjacent tracker box. This shaft has an actuating arm 100 which is connected by a link 101 with one end of a lever 102 pivoted at 102L tothe tracker box. A link 103 connects the opposite end of said lever with the flushing valve 93. As seen in Fig. 41, the 1inger 97 of each tracker box bears against the convolutions of the music sheet opposite a transverse groove 10-1 in the periphery of the take-up roll, the finger bearing constantly against the music sheet by its own weight. This recess has anabrupt rear end 105 referring to the direction of travel of the take-up roll during the rewinding of the music sheet. So long as the recess rcmains covered by the music sheet during the rewinding operation, the finger is held in a retracted position, as shown in Fig. 1, but when the recess is uncovered by the complete unwinding of the music sheet, the finger drops into the recess, bringing` its free end into the path of the abrupt end thereof which thereupon depresses the finger and causes the shaft 99 to be rocked in the proper direction to open the valve 93. rlhe releasing` valve 83 or S9, as the case may be, is thereby actuated, inflating the rewind pneumatic 24 and shifting the transmission gear 21 into neutral or stop position. A pin 106 projecting laterally from the lever 102 into the path of the rock arm 20, is preferably employed to assist the rewind pneumatic in disconnectingl the transmission gear 21 from the idler 16.

During the rewind of each music sheet, the companion tracker is cut ofiz from the main wind chest 1 by anyr suitable means, but I prefer to employ the mechanism shown in the drawings which is constructed as fol lows:

` 107, Fig.'2, indicates a cut off or chest preferably arranged on top of the main wind chest 1 and Vcontaining a pair of pouch or valve chambers 10S and 109. One of these chambers, say the chaiuber 108, is connected by a conduit 110 and the conduit 33 with the secondary valve chamber 31- of tracker A, while the chamber 109 is connected by a conduit 116 and the conduit 6l with a valve chamber, similar to the valve chamber 311, controlled by the secondary valve 65 of tracker B, whereby each of said chambers is alternately exhausted and flushed by the raising and lowering of the secondary valves 35 and 65, respectively. Arranged in the cut off chest 107 adjacent to the pouch chamber 108 are a plurality of channels 112, respectively connected with the note ducts 72 of tracker A by conduits, one of which is shown at 113, and arranged adjacent to the other pouch chamber 109 is a similar set of channels 114 respectively connected with the note ducts 72 of tracker B, by conduits, one of which is shown at 115. The pair or set of channels 112 and 114 corresponding to like note ducts of the two tracker boards 6, both communicate with a common channel 116a leading to the primary pneumatic 117 which controls the valve 118 of the corresponding striker pneumatic 2. Each of the channels 112 is interrupted by a partition 119 and provided at opposite sides thereof with ports 120 which are covered by a pouch or diaphragm 121 secured at its edges to the bottom of the upper pouch chamber 108. This pouch forms a valve, which, when lowered against the upper edge of the partition 119, closes the ports 120 and cuts off communication between the corresponding striker pneumatic 117 and the corresponding duct of the board 6 of the tracker A; while when said pouch valve is raised, it .opens the ports 120 and forms a passage between them, thereby connecting said striker pneumatic with the corresponding tracker board duct. It will be understood that there is such a pouchvalve for each channel 112.

Each of the channels 114 has a similar partition 122 and a pair of ports 123 controlled by a pouch-valve 124.

From the foregoing it will be seen that when the playing pneumatic bellows 23 of tracker A is collapsed by the opening of the pallet 48, the pouch chamber 108 of the corresponding tracker is at the same time exhausted, opening the pouch-valves 121, as shown in Fig. 2, and couplinothe tracker r. to the main wind chest. Bimultaneously with this action, the pouch chamber- 109 is flushed by the opening of port :l by said pallet 48, closing the ports 123 and cutting 0H the tracker B from the main wind chest. Likewise, when the pallet 61c is opened, the pouch valves 124 corresponding to tracker B are opened and the pouch valves 121 corresponding to tracker A are closed, coupling the latter to the main wind chest and cutting off the tracker A therefrom.

lVhile one music sheet is being played,` it is desirable at times to select some particular piece on the idle sheet and bring it into position ready to be promptly played'. This is preferably accomplished by the following means:

The shaft 11 of the take-up roll is provided with an auxiliary spur gear 125 which engages an idler 126 journaled on a vertically movable arm or shifting member 127 pivoted on the shaft 11. This idler is in turn adapted to engage the spur gear 19. The several gears are so proportioned that whenthe idler 126 is moved to operative position,'thetake-up roll isdriven forwardly more rapidly than playing speed, thus saving time in selecting the desired composition.

' Each ofthe v'gear-carrying arms 127 is shifted in one direction by a selecting pneumatic 128 connected with it by a link 129 and serving, when collapsed, to lower the arm into operative position. A spiral spring 130 raises the arm 127 into inoperative position when said pneumatic 128 is ushed. The two selecting pneumatics 128 of the trackers A and B are connected by conduits 131, 131a with separate valve chambers in the auxiliary wind chest 31 controlled by secondary valves 132, 133 and corresponding primary valves 134, 135. The primary selecting valve 134 of tracker A is connected by a conduit 136 with a duct 137 formed in a duct board 137a controlled by a pallet-valve 138 shown in F i g. 6. This duct is operated by a push-button 139. The primary selecting valve 135 of tracker B is connected by a conduit 140 with a duct controlled by a similar pallet valve having a push button 141. By pushing one or the other of the buttons 139, 141 the corresponding selecting pneumatic 128 is collapsed, shifting the associated selecting gear into operative position.

At the end of each piece on the music sheet, there is preferably a stop-perforation 148 which coperates with a corresponding tracker duct and serves to arrest the forward selecting movement of the sheet. For this purpose, a releasing or select off valve 142 located in the auxiliary wind chest 31 is connected by a conduit 143 with a duct 144 of tracker A cooperating with such a stop perforation, while a similar releasing or select off valve 145 is connected by conduit 146 with a duct 147 of tracker B. These select- oil valves 142 and 145 act upon the secondary selecting valves 132 and 133 in the same manner as the releasing valve 56 acts upon the secondary valve 35, serving when actuated to Hush the selecting pneumatic 128 of the corresponding tracker A or B, thereby shifting the selecting mechanism into inoperative position and stopping the sheet.

In selecting a composition near the end of the music sheet, the latter is liable to unwind completely from the music roll. To prevent this, means are provided for automatieally disconnecting the selecting gear 126 from the driving gear 19,1130 stop the forward travel of the sheet and shifting the roll-driving mechanism into rewind position. To accomplish this, the select-off valve 142 of tracker A is connected by a conduit 149 with the channel 150 leading to a port 151 controlled by the pallet 61c which in turn is controlled by tracker A. The select-off valve 145 of tracker B is likewise connected by a conduit 152 with a channel 153 and port 153, the latter being controlled by the pallet 48, which is in turn controlled by tracker B. By this arrangement, the select-off valve 142 or 145 is actuated simultaneously with the primary rewind Valve 81 or 89 by the opening of the rewind pallet 61c or 48, as the case may be, throwing the selecting mechanism of either tracker into inoperative position `and at the same time shifting the corresponding rewinding mechanism into operative position.

Under ordinary conditions, each roll driving mechanism is automatically thrown into rewind. position after the corresponding music sheet has been fully played and continues to rewind the sheet until it is automatically stopped. The selecting is done manually and as the operator is apt to do so during the rewinding operation, means must be provided t-o shift the corresponding ,transmission gear 21 into neutral or inoperative position before the selecting mechanism is thrown into operative position, otherwise the rewind mechanism will interfere with the selecting mechanism. This shifting action is accomplished preferably by the following means:

154, 154tL indicate conduits leading from ports controlled by the selecting` buttons 139, 141, respectively. The conduit 154 connects with the conduit 95 associated with the rewind off or releasing valve 83 which controls the rewind pneumatic 24 of tracker A. The conduit 154EL connects with the conduit 90 associated with the rewind oft or releasing valve 89 which controls the rewind pneumatic 24 of tracker B. It follows th at when either of these selecting buttons is operated the corresponding' selecting pneumatic 128 is collapsed. shifting the selecting gear 126 into operative position, while the corresponding rewindy pneumatic is iushed, shifting the associated transmission gears 21, 22 into inoperative position.

Mechanical means are also preferably employed to prevent the shipper arm 2O from being shifted into rewindvor take-up position while the arm -127 of the selecting mechanism is in its operative or selecting position. These devices consist of links 127@L and 127 pivoted to the arm 127 and extending downwardly on either side of the driving` shaft 18. 20 and 2Ob indicate screws passing through slots 127c and 127 d in said links, respectively. Then the arm 127 is in its lower or playing position, the upper ends of these slots bear against the screws 20a, 20h, locking lthe shipper arm 2O against movement. These slots are of such a length that when the arm 127 is in its inoperative position. as shown in the drawings, the arm 20 is allowed to move up or down the required distance to throw the transmission gears 21, 22 into take-up or rewind Position. lVhen the arm 2O is shifted into either of these positions, it locks the arm 127 in its inoperative position throughV the medium of the slotted links 1272, 1271, in an obvious manner.

As before stated, after one music sheet has finished playing, a perforation at or near its end causes the other' sheet to start playing. As the operator might be in the act of selecting a piece on the idle music sheet at the time this change occurs, mea-ns are provided to cut off each selecting pneumatic 128 from the suction chamber 32, an instant before the corresponding playing pneumatic 23 is collapsed. This allows the spring 130 to withdraw the selecting gear 126 from the drive gear 19, preventing said selecting gear from interfering with the operation of the playing gear 22. To accomplish this an additional port 151iL is connected with the conduit 149 leading to the releasing or select off valve 142 which serves to flush theselecting pneumatic 128k of tracker A, said port 151a being` controlled by the rewind pallet 48 of tracker B. For the same purpose, an additional port 152 is connected with the conduit 152 leading to the releasing of select off valve 145 of tracker B, said port 152a being controlled by the rewind pallet 61C of tracker A. This arrangement renders it impossible for the selecting and playing gears 126 and 22 of the same tracker to come into operation at the sametime..

To permit manual as well as automatic control of the roll-driving mechanism, the primary playing valve 39, rewind-oftn valve 83, select off-valve 142 of tracker A and the playing-off valve 68 of tracker B are connected by conduits 155, 156, 157, 158, respectively, with `ports controlled by a pallet actuated by a push button 159, while the primary playing valve 64a, rewind off-valve 89, select-off valve 145 of tracker B and the playing-oit' valve 56 of tracker A are connected by conduits 160, 161, 162 and 163, respectively, to ports controlled by a pallet actuated by a push button 164. By this manual control, either sheet can be started and the other simultaneously stopped.

To manually control the rewinding of the idle music sheet, at will, the primary rewind valve 81, primary play-off valve 56 and the select-off valve 142 of tracker A are also connected by conduits 165, 166, 167, respectively, with ports controlled by a pallet actuated by a rewind -push-button 168, while the primary rewind valve 85, playing-off valve 68 and the select off-valve 145 of tracker B are connected` by conduits 169. 17 0, 171. respectively, with ports controlled by a pallet actuated by a rewind push button 17 2.

17 3 inni .ates a controlling boX having chambers 174, 175 and a channel 176 connecting them. Diaphragm .valves 177, 178

are adapted to ,normally close the ends of mosphere entering through the conduit 181,

opens both diaphragm valves 177, 178, and passes thence through the conduits 179, 180 and raises the playing-off valves 56 and 68, flushing whichever playing pneumatic 23 is collapsed and stopping the roll-driving mechanism and music sheet controlled thereby. By this push'button 182 the sheet which is being played may be stopped without affecting the operation of the other sheet.

As best seen in Fig. 16, 183 indicates a pressure wind chest with which is combined one or more stops, such, for violin pipes 184 which ordinarily play in concert with the piano treble.

This stop Vand its Valve mechanism may be of any suit-- able or well known construction. In the eX- ample shown in the drawings, they are located. in a case 185 adjacent to the piano. 186 indicates the pressure chamber connected with the usual pressure bellows 187 by the tube V188; 189 one of the valves or pallets arranged in said chamber and V190 the usual stop-slide. As shown in Fig. 2, this slide may be operated by a pneumatic 191, the movable board of which engages the slide. A spring 192 tends to shift the slide to its closed position.. 193 indicates an auxiliary wind chest preferably arranged beneath the keytable and having its suction chamber 194 connectedby trunks 195 and 5 with the Amain suction bellows 3. The pneumatic 191 is connected by a conduit 196 with a valve chamber 197 in thechest 193, which chamber is connected with the atmosphere by port-s 198 and with the suction chamber 194 by ports 199. These ports are controlled by a duplex valve 200 of ordinary construction, which in turn is controlled by a diaphragm 2003. The pneumatic 191 is collapsed or inflated by the action of said valve, thereby shifting the stop-slide into open or closed position. The pipe stop or stops may be coupled to either tracker to play in concert with either of the music sheets, the mechanism shown in the drawings for this purpose being constructed as follows:

It comprises two auxiliary stop wind chests 201c and 201.d containing Valve mechanisms for controlling said stops. For brevity they will be hereinafter referred to as wind chests C and D, and as they are identical in. construction, a description of one will sufiice for both. They are preferably arranged below the key table and their suction chambers 202 (iF ig. 2) are connected instance, asV

' arranged below with the main suction bellows 3 by the trunks 203, 204, 195 and 5, as shown in Fig. 1. A, valve chamber 205 is connected with the atmosphere by ports 206 and with the suction chamber 202 by ports 207, which ports are controlled by a duplex Valve 208 the heads of which are arranged on the outer side of said Valve chamber'. The valve chambers 205 of the chests C and D are connected by channels 209 and conduits 21,0 and 211, respectively, with the chamber beneath the diaphragm 200a Yof the main stopwind chest 193. Each channel 209 is interrupted by a partition 212 and provided at opposite sides thereof with ports 213, 214 adapted to be covered or uncovered by a valve diaphragm 216 secured to the wall of a pouch chamber 217. Then closed against the partition 212, this pouch Valve cuts oil'I communication between the diaphragm 2001 and the valve chamber 205 and when opened establishes communication betweensaid parts. A channel 218 provided with the customary bleeds 219, 220 connects the valve chamber 205 with the underside of the diaphragm 215 of the valve 206. The pouch chamber 217 of chest C is connected by a conduit 221 and the conduit 33 with the Valve chamber 34 of the secondary playing Valve 35, Fig. 12, while the pouch chamber 217 of the chest D is connected by a conduit 226 and the conduit 64 with the valve chamber of the secondary playing Valve 65. Each of said pouch chambers is thus exhausted simultaneously with the corresponding playing pneumatics 23 keeping the pouch Valve 216 open as long as said pneumatic remains collapsed.

When the valve 208- is raised by the diaphragm 215, atmosphere entering through the channel 218 retains said diaphragm and Valves in that position while the atmosphere entering through the if'alve chamber 205, channel 209 and conduit 210 the diaphragm 200 and the valve 200, col-- lapsing the pneumatic 191, shifting the slide 190 to open position and causing the pipes to play in concert with the active music sheet.

During the playing of each music sheet, the controlling valve 208 in the other stop act-ion chest C or D is cut off from the tracker by any suitable means, but I prefer to employ the mechanism shown in the draw ings which is constructed as follows:

222 indicates a cut off chest whichmay be the chest 201d and which contains pouch or valve chambers 223, 224. One of these chambers, say the chamber 223, is connected by a conduit 225 and the conduit 221 with the same source of tension as the playing pneumatic 23 of tracker A, while the chamber 224 is connected by a conduit 226 and the conduit 64 with the same source 0f tension as the playing pneumatic 23 of tracker B, whereby each of these chambers or 211 raises Cil is alternately exhausted and flushed simultaneously withthe respective playing pneumatics. Arranged in the cut ott chest 222 adjacent to the pouch chambers 223 and 221 are channels 227 and 228, respectively. The channel 22' is connected by a conduit 229 with the diaphragm 215 of the auxiliary wind chest C and with a duct 230 of tracker A by a conduit 231, while the channel 228 is connected by a conduit 232 with the diaphragm 215 ot the auxiliary wind chest D and with a duct 233 of tracker B by a conduit 231. The channel 227 is interrupted by a partition 235 and provided on opposite sides ot said partition with ports 230 which are covered by a pouch valve or diaphragm 237 which establishes or cuts ott communication between the corresponding tracker duct and the diaphragm.

The channel 228 of tracker B has a similar partition 238 and a pair ot ports 239 controlled by a pouch valve 210.

As the conduit 221 leading from the pouch chamber 217 ot the chest 201C and the conduit leading from the pouch chamber ot the cut-oitl chest 222 are both connected with the conduit 33 leading to the playing pneumatic 23 of tracker A, they are exhausted when said pneumatic is collapsed to play the sheet of Vtracker A, thereby opening the pouch valves 210 and 237 and establishing communication between the duet ,230 of tracker .A and the diaphragm 215 and also between the valve chamber 205 ot the auxiliary chest 201c and the diaphragm 200:L of the valve 200 which controls the slide pneumatic 191, thus coupling the pipe-stop to tracker A. At the same time, the pouch chamber 217 ot the chest 201d and the pouch chamber 221 of cut-ott chest 222 are both flushed simultaneously with the playing pneumatic 23 et tracker B, closing their respective pouch valves and cutting off communication between the duct 233 of tracker B and the stop-controlling valve 200 of the chest 2011.

The raising of the controlling valves 208 is e'ccted by pert'orations 211 in the music sheets registering with the ducts 230 and 233 of the tracker boards A and B in a well known manner. These valves are retained in their raised position and released at the proper time by the valve mechanism shown in Fig. 11, which is similar to that illustrated in Fig. 12. Referring to Figs. 2, 13 and 11, each of the chests 201C and 201*1 contains a pouch chamber 213 which is connected by a channel 211 with a valve chamber 215 alsoarranged in said chest. This chamber communicates with the atmosphere by ports 210 and with the suction chamber 202 by a port 217. Applied to these ports is a duplex releasing valve 218 controlled by the usual diaphragm 219. The pouch chamber 213 communicates with the suction chamber 202 and the channel 218 by ports 2517 252, respectively, which are controlled -by a pouch or valve 250 similar to the valve 58. Nhen the valve 218 is raised, the pouch chamber 213 is exhausted, raising the pouch 250, as shown in Fig. 13, and uncovering the ports 251, and exhausting the channel 218, thus allowing the valve 208 to drop and cutting ott communication between the diaphragm 200a of the stop chest 193 and the atmosphere. The diaphragms 219 of the chests 201c and 201*l are connected by conduits 253 and 251 with tracker ducts 255 ot trackers A and B, respectively, and are controlled by coperating peritorations 250 .in the music sheets. It will now be understood that the valve 208 which is associated with the music sheet that is playing for the time being effects the alternate exhaustion and iushing o1 the slide-controlling pneumatic 191.

For the purpose of manually controlling the stops when playing the piano manually, additional mechanism is provided tor actuating the duplex valve controlling the slide pneumatic 191, which constructed as tollows:

257, Fig. 2, indicates an auxiliary valve chamber located in the main stop-chest 1.93 and provided with ports 25 8 an( 259 leading to the atmosphere and suction chamber, 191, respectively. These ports are centroll .d by a duplex valve 200 actuated by a diaphragm 207 ot ordinary constructionl` the heads ot the valve being arranged on the outside oit the valve chamber The latter is connected by a channel 201 with a pouch chamber 202 which in turn is connected by a channel 203 with the diaphragm 200. Obviously the raising and loweringot the valve 200 causes a corresponding action of the valve 200 which controls the movement of the slide 191. The diaphragm 207 may be controlled directly a pallet or push button 209, similar to the pallet 138 and button 139, conveniently located at the front et the instrument. However, when playing automatically .it is desirable to render the manual controlling valve 200 inoperative, and 'for this purpose it is preterably combined with a cut-0H? mechanism which includes a pouch chamber 201 located in the cut-ott chest 222 and a coperating channel 205 adjacent to the pouch chamber. This channel is connected by a conduit 200 with the chamber beneath the diaphragm 207 and by a conduit, 208 with an atmospheric duct controlled by the button Like the Channels 227 and 228, the channel 205 is interrupted vby a partition. 270 and provided on opposite sides thereof with ports 271 controlled by an ordinary pouch-valve 272. I The pouch chamber 201 is connected by a conduit 2,01L with a valve chamber 273 communicating by a port 271 with the atmosphere and a port 275 with a. suction chamber 276. The latter is connected by a conduit 277 and the conduit 5 with the main suction bellows 3. A duplex valve 278 actuated by a diaphragm 279 controls the ports 274, 275. This diaphragm is connected by a conduit 280 with a flushing channel 281 which may be interrupted by a partition 282 and provided on opposite sides thereof with ports 283, controlled by a D-valve 284. This valve is connected with a pair of motor- pneumatics 285 and 286 by a link 287. The pneumatic 285 is connected by the conduits 288 and 221 with the suction conduit 33 of the playing pneumatic 23 of tracker A, while the pneumatic 286 is connected 'by conduits 289 and 226 with the suction conduit 64 of the playing pneumatic 23 of tracker B. 1t follows that when either of the playing pneumatics 23 is collapsed, the corresponding pneumatic 285 or 286 is also collapsed, shifting the D-valve 284 in the proper direction to close the flushing channel 281 and cutting oilA the atmosphere :from beneath the diaphragm 279. The valve 278 is therefore allowed to drop, admitting atmosphere to the chamber 264, closing the pouch valve 272 and cutting off the manual valve 260 from its controlling` device 269.

Then playing the instrument automatically, it is also desirable to cut oif communication between the suction chamber 194 of the manually-controlled compartment of the main stop wind chest and the diaphragm 200a of its automatically-controlled compartment, so that said manual control can not interfere with the operation of the valve 200 inthe last-named compartment when actuated from the tracker boards. To that end, a pouch or cut-olf valve 290 is arranged in the pouch chamber 262 of the main stop chest 193 and said chamber is connected by conduits 291 and 264 with the valve chamber 273. The pouch chamber 262 is thus likewise flushed when either of the pneumatics 285 or 286 is collapsed, closing the pouch valve 290 and cutting off communication between the suction chamber 194 and the diaphragm 200,

The operation of the apparatus is as follows:

In Fig. 2, the parts of tracker A are in position to play its music sheet, the parts of tracker B are in position to rewind its sheet and the controlling perforation 92 at the end of the music sheet of tracker A has just come into register with the corresponding tracker-duct 79. Under these conditions atmosphere enters thisV tracker-duct and passes through the conduit 78 and raises the valve 7 6a (similar to the valve 76, Figs. 2 and 15), establishing communication between the auxiliary suction chamber 32 and the pneumatic 63, collapsing the latter and opening the pallet 61c shown in Fig. 7. Atmosphere now enters the port 67a and conduit 66 and actuates the primary and secondary playing valves 65, 65 ot tracker B, collapsing the playing pneumatic 23 ot said tracker B and moving the corresponding shipper arm 20 into playing position to drive the take-up roll. Simultaneously with this action, the driving mechanism of tracker A is shifted into rewind position by the uncovering of the port 81c by said pallet 61C. The atmosphere entering` said port and the conduit 81l causes the primary and secondary rewind valves 81 and 82 to be shifted to the proper position to connect the rewind pneumatic 24 of tracker A with the auxillary suction chamber 32, collapsing it and shifting the corresponding arm 20 into rewind position. This arm remains in this position until the music sheet of tracker A is rewound, when, the finger 97 enters the recess 104 of the corresponding take-up roll and is tripped and caused to open the stoppallet 93 of tracker A. Atmosphere now enters the conduits 95 and 83a and raises the rewind-oit or releasing valve 83, allowing the primary rewind valve 81 and the secondary valve 82 to drop as before described, therebyflushing the rewind pneumatic 24 of tracker A, shifting the arm 20 into neu-- tral position and stopping the rewind operation. Said arm is held in this position by the spring 28 shown in Fig. 10.

The moment the music sheet oi. tracker B is taken up for playing, the playing pneumatic 23 of tracker A is flushed, shift-ing the corresponding shipper arm 20 to neutral position, and at the same time the companion tracker board is disconnected from the main wind chest. This is eil'ected by the opening of port 61b controlled by the pallet 61. Atmosphere thereupon enters the conduit 61 and raises the releasing or playing-oill valve 56, lowering the primary valve 39 and the secondary valve 35 and flushing the playing pneumatic 23, through the conduit 3.3, as hereinbeiore described, and simultaneously flushing the cut-off chamber 108 through the conduit 110 branching from the conduit 33. The pouch valves 121`V are thereby closed, breaking communication between the board 6 of tracker A and the main wind chest 1. The pouch valves 124 of the other cut-oli' chamber 109 are at the same time opened, as before explained, estalblishinf` communication between the board oi tracker B and said main wind chest.

The music sheet of tracker B continues to play until its controlling perforation 92 registers with the corresponding tracker duct 79, whereupon atmosphere enters the conduit 78 and raises the valve 76, Fiofs. 2 and 15, connect-ing the pneumatic 50 Fig. 7) with the auxiliary suction chamber 32 and collapsing it and opening the pallet 48.

The atmosphere now enters the ports 68a and conduit 87, causing the primary and secondary valves S5 and 86 to be raised and the rewind pneumatic 2-1 ot tracker B to be collapsed, as hereinbetore described, thereby moving the corresponding rock arm 20 to the position shown in Fig. 2 and rewinding said sheet.

The opening. of the pallet l1S causes the pneumatic 23 of' tracker A to be collapsed, again taking up the corresponding sheet; at the same time the pouch valves 121 of tracker A are opened and the pouch valves 124. of tracker B are closed, thus silencing the latter.

1f, while the music sheet of tracker A is playing and the music sheet of tracker B is rewinding, it is desired to play the sheet of tracker B and stopthe sheet ot' tracker A, the button 1611 shown in Fig. 2 is pressed by the operator. Atmosphere through the duf- ts 160 and 66 actuates the primary and secondary playing valves 64, 65, collapsing the playing pneumatic 23 of tracker B, and shitting the respective arm 2O into playing position, while atmosphere entering the ducts 163 and 61L actuates the releasing valve 56 of tracker A, shitting the arm 20 ot thelatter into neutral or stop position, as ieit'ore described.

In a similar manner, the sheet-driving mechanism oit trackerl A may be manually thrown into playing position while the sheet of tracker B is playing, by pressing the button 159, the conduit 155 leading from this button to the conduit 44; which leads to the actuating-diaphragm of the primary valve 39.

To select some particular piece on the music sheet of tracker B while the music sheet of tracker A is playing, the operator pushes the button 141. By this movement atmosphere is admitted to the duct 140, actuating the primary and secondary selecting valves 135 and 133, collapsing the selecting pneumatic 128 of tracker B, thereby engaging the selectinggear 126' with the gear 19 and driving the take-up roll forward at increased speed. At the end of each piece on the sheet, a select-off perforation 1418 is cut which is arranged to register with the tracker duct 147. lVhen this occurs, the select-off valve 141-5 is actuated and in turn actuates said primary `and secondary select valves, as before described, thereby throwing the selecting mechanism into inoperative position. 1t is necessary to press the select button 141 at the end of each piece until the desired composition is brought in position ready to be played. Selections may likewise be made on the sheet of tracker A by pressing the button 1.39.

r1`he moment the sheet of tracker A starts playing, the pouch or coupler valve 216 of the chest C and the pouch valve 237 ot the chamber 223 areopened, as shown in Fig. 2, establishing communication between the valve :hainber 205 of chest C and the diaphragm 2O()a et the slide-controlling valve 200, and between the conduit 231 of tracker A and the diaphragm 215 ot chest C, and whenever a pipe-stop perforation of the sheet ot tracker A passes the latter, the valve 20() is actuated and the slide 190 is opened,causing the pipes to play in concert with the piano. 1n like manner, when trzicker B begins to play, the pouch valve 216 of the chest D and the pouch coupler valve 2-1-0 are opened, establishing communication between the valve chamber 205 et chest D and said diaphragm 200 and between the conduit 234e of tracker B and the diaphragm 215 ot chest l); and whenever a pipe-stop perforation of tracker B passes the latter, the valve 200 is actuated and the pipes are caused to play in concert with the piano. lhenever one of the perforations 256 registers with the duct 253 of either tracker, the corresponding releasing valve 2-1-3 is actuated, lowering the valves 20S and 200, [iushing the pneumatic 191 and allcuving the spring 192 to close the stopslide 190.

Should 'tracker B, for example, be thrown linto operation manually by pressing the button 16-1, while tracker A and the pipe-stops are playing in concert, the playing-oit valve 56 ot tracker A will be actuated, thereby flushing the playing pneumatic 23 of tracker A and returning 4the corresponding rolldriving mechanism to neutral position. At the same. time the conduit 221 is also flushed, thus closing the pouch valve 216 of the chest C and the pouch-valve 237 in chamber 223, andcutting the tracker A off from the chest C and the latter off from the slide-controlling valve 200.

TWhen the piano is played manually, the pneumatics 285 and 286, Fig. 2, are both in their inflated position and the D-valve is in position to admit atmosphere under the diaplnfagm 279, thus raising the valve 27 8,

- exhausting the pouch chamber262 and opening the pouch or coupler valve 290 to establish communication between the diaphragm 2O()n ofthe main slide-controlling valve 20() and the valve-chamber 257 ot the auxiliary slide-controlling valve 260. Under these conditions should it be desired to manually throw on the pipe-stop to play in concert with the piano, the performer presses the button or tablet 269, whereupon the atmosphere entering through the duct controlled bythe same opens the pouch or coupler valve 271, passes through the conduit 266 and lifts the auxiliary slide-controlling valve 260, thereby causing the main slide-controlling valve 200 to rise, 'collapsing the pneumatic 191 and opening the stop-slide 190.

Various changes or modiications coming within the scope of the appended claims, may obviously be made in the instrument, and I do not therefore wish to be limited t0 the particular construction herein shown and described.

I claim as my invention:

1. In an instrument of the character described, the combination of a wind chest, a

plurality of tracker mechanisms each in-` cluding a tracker board and music and takeup rolls associated therewith, driving mechanism including shiftable members for alternately rotating the rolls of each tracker in opposite directions, playing pneumatics for moving said shiftable members into playing position, a pneumatic cut-off for each tracker to disconnect the same from the wind chest, the playing pneumatic and the cut off of each tracker' being connected together to act in unison, valve mechanism for controlling said playing pneumatics and cut-offs, rewind pneumatics for lmoving said shifting members into rewind position, valve inechanism for controlling said. rewind pneumatics, and pneumatic Vactions controlled by the trackers for actuating said valve mechanisms.

2. In an instrument of the character described, the combination of a plurality of trackers, roll-driving mechanism associated with each tracker, a set of playing and rewind pneumatics for controlling each of said roll-driving mechanisms, valve mechanisms controlling said pneumatics, a ductboard having playing and rewind ducts cooperating with said valve -mechanisms, valves coperating with said duct-board and each controlling the playing duct of one tracker and the rewind duct of another tracker, and means for controlling said ductboard valves.

In an instrument of the character described, the combination of a plurality of trackers, each having a controlling duct, roll-driving mechanism associated with each tracker, a set of playing and rewind pneumatics for controlling each of said rolldriving mechanisms, valve mechanisms controlling said pneumatics, a duct-board having playing and rewind ducts coperating with said valve-mechanisms, valves coperating with said duct-board and each controlling the playing duct of one tracker and the rewind duct of another tracker, and means controlled by said tracker ducts for actuating said duct-board valves.

l. In an instrument of the character described, the combination of a plurality of trackers, each having a controllingrduct, roll-driving mechanism associated with each tracker, a set of playing and rewind pneumatics for controlling each of said rolldriving mechanisms, valve mechanisms controlling said pneumatic. a duct-board having playing and rewind ducts coperating by said driving with said valve mechanisms, valves coperating with said duct-board and each controlling the playing duct of one tracker and the rewind duct of another tracker, means controlled by said tracker-ducts for actuating said duct-board valves, and manual valves also controlling the ducts of said duct-board.

5. In an instrument of the character described, the combination of a plurality of trackers, roll-driving mechanism associated with each tracker, a set of playing and rewind pneumatics for controlling each of said roll-driving mechanisms, valve mechanisms controlling said pneumatics, a ductboard having playing and rewind ducts cooperating with said valve mechanisms, valves coperating with said duct-board and each controlling the playing' duct of one tracker and the rewind duct of another tracker, separate pneumatics for actuating said duct-board valves, and pneumatic ae'- tions controlling the last-named pneumatics and in turn controlled by the trackers, respectively.

G. In an instrument of the character described, the combination of the music and take-up rolls, rewind and take-up gears for said rolls respectively, a driving member,

lshiftable main transmitting gears for alternately connecting up gears with said said rewind and takedriving member, a shiftable auxiliary gear for transmitting motion from said driving gear to the take-up roll, and means for locking said main transmission gears in neutral. position when said auxiliary gear is shifted to operative position and vice versa.

7. In an instrument of the character described, the combination of the music and take-up rolls, a rewind shaft having a gear, a take-up shaft having dilferent sized gears, a driving gear, a shipper member carrying main transmission gears arranged to alternately engage said rewind gear and one of the geais of said take-up shaft, said transmission gears being driven by said driving gea-r, an auxiliary selecting gear arranged to transmit motion from said driving gear to the other gear of the take-up shaft, a movable supporting-member for said selecting gear, and means controlled by said supporting member for lockingv said shipper member in neutral-position. A

8. In an instrument of the character described, the combination of the music and take-up rolls, a rewind shaft having a gear,

' a take-up shaft having different sized gears,

adriving gear, a Shipper arm fulcrumed between its ends on the shaft of said driving gear and carrying main transmission gears arranged to alternately engage said rewind gear and one of the gears of said take-up shaft, said transmission gears being driven gear, an auxiliary selecting rampes gear arranged towtransinit motion fromsaid driving gear to the other gear of the take? up shaft, a movable supporting-ineinber for said selecting gear, and slotted locking links pivoted to said supporting member and connected with said shipper member by fpins passing through their slots and arrangedk on opposite sides of the driving-gear shaft.

9. In an instrument of thencharaeter described, the combination of the music and take-up'rolls, a. rewind shaft having a gear, a take-up shaft having different sized gears, a driving gear, a shipper member'carrying main transmission gears arranged to alternately engage said rewind gear and one of the gears of said take-up shaft, said transmission gears being dri'ven by said driving gear, an auxiliary selecting gear arranged to transmit motion fromfsaid driving gear to the other gear of the'take-up` shaft, a inovable supporting-member for said selecting gear, and locking means controlled by said shipper and supporting members and arranged to lock one of said members in neu? tral position when the other is shifted to operative position.

10. In an instrument of the character described, tlie combination of a plurality of trackers eaclihaving a controlling duct, rolldriving mechanism associated with each tracker, a set of playing and rewindpneumatics for controlling each of said roll-driving mechanisms, rewind valves controlling the respective rewind pneumatics, valve -mechanism for controlling each of said playing pneumatics, each of said playing valve mechanisms including means for retaining the playing valve in position to exhaust the associated playing pneumatic and a releasing valve for causing said playing valve to resume its normal posit-ion to flush said playing pneumatic, a controlling box containing flushing chambers and a channel connecting said chambers, valves applied to said channel, conduits leading from said chambers to said releasing valves, respectively, and manual means controlling the admission of the atmosphere to saidv channel.

11. In an instrument of the character described, the combination of a plurality of trackers, roll-driving mechanism associated with each tracker, a shipper member for the driving mechanism of each tracker, shifting pncuinatics for said members, a pneumatic action controlling said shifting pneumatics and each comprising a. suction chamber, a valve-chamber connected with one of said pneuinatics and communicating by ports with said suction chamber and the atmosphere, a valve-controlling said ports and a diaphragm for actuating the valve, means for retaining said valve in its operative position including a. suction-channel leading from said diaphragm to said suction-chamber, a valve controlling said channel, and a releasing valve controlled by one ol' said trackers and controlling the last-named valve.

. 12. In an instrument of the character described, tlie combination of a plurality of trackers, roll-driving mechanism associated ith each tracker, playing pncuinatics controlling said driving mechanisms, valve mechanisms controlling said piieuinatics, a pipe-stop having a slide, a pneumatic for shifting said slide, a plurality of pneumatic stop-actions controlling said slide-shifting pneumatic and respectively controlled by the trackers, and means controlled by the 'valve mechanisms of said playing piieuinatics for rendering each of said stop-actions opera tive or .inoperative simultaneously with the corresponding playing pneumatic.

13. In an instrument of the character described, the combination of a plurality of trackers, roll-driving` mechanism associated with each tracker, playing pneumatics con- 1trolling said driving mechanisms, valve mechanisns controlling said pneumatics, a pipe-stop and its slide, y a shifting pneumatic for said slide, a main stop wind chest containing a main valve for controlling said slide-pneumatic, auxiliary stop wind chests, respectively associated with the trackers and each containing an auxiliary valve which controls said main valve, each of said auxiliary valves being controlled by one of the trackers, `and separate cut-offs between said auxiliary val ves and said main valve, controlled by the valve-ineclianisins of said playing pneuinatics.

14. In an instrument of the character described, the combination of a plurality of trackers having controlling ducts, roll-driv ing mechanism for each tracker, a playing pneumatic associated with each tracker for controlling the respective roll-driving mechanism, valve mechanisms controlling said playing pneumatics, a pipe-stop having a slide, a shifting pneumatic for said slide, a main stop-Wind chest containing a main valve controlling said slide-pneumatic, auxiliarystop wind-chests each containing an auxiliary valve which controls said main valve, pneumatic cut-offs interposed between said auxiliary valves and said main valve Iand respectively controlled by the valve mechanisms ot said playing pneuinatics, conduits leading from said tracker-ducts to said auxiliary valves, respectively, and pneumatic cut-oii's interposed in said con duits and controlled by the valve mechanisms of the playing pneuinatics.

15. In an instrument of the character described, the combination of a plurality of trackers, roll driving mechanism associated with each tracker, playing pneumatics controlling said driving mechanisms, valve mechanisms controlling said pneuinatics, a

scribed, the combination of a pipe-stop and its slide, a shifting pneumatic for said slide, a main stop Wind-chest containing a main valve for controlling said slide-pneumatic, auxiliary stop Wind chests, respectively associated with the trackers and each containing an auxiliary valve which controls said main valve, each of said auxiliary valves being controlled by one of the trackers, cut-off means between each of said auxiliary valves and said main valve, and a manually-controlled valve also controlling said main valve. c

16. In an instrument of the character deplurality of trackers, roll driving mechanism associated with each tracker, playing pneumatics controlling said driving mechanisms, valve mechanisms controlling said pneumatics, a pipe-stop and its slide, a shifting pneumatic for said slide, a main stop Wind-chest containing a main valve for controlling said slide-pneumatic, auxiliary stop Wind chests, respectively associated with the trackers and each containing an auxiliary valve Which controls said main valve, each of said auxiliary valves being controlled by one of the trackers, cut-ofi' means between each of said auxiliary valves and said main valve, a manually-controlled valve also controlling said main valve, and means for automatically cutting-01T said manual valve from said main valve when the latter is actuated automatically.

17. In an instrument of the character described, the combination of a pluralityrof trackers, roll-driving mechanism associated with each tracker, playing pneumatics controlling said driving mechanisms, valve mechanisms controlling said pncumatics, a pipe-stop having a slide, a. pneumatic for shifting said slide, a plurality of pneumatic stopactions controlling said slide-shifting pneumatic and respectively controlled by the trackers, means controlled by the valve mechanisms of said playing pneumatics for rendering each of said stop-actions operative or inoperative simultaneously with the corresponding playing pneumatic, a supplemental pneumatic valve also controlling said slide-shifting pneumatic, manual means for controlling the last-named valve including a conduit leading thereto, a cutoff chamber interposed in said conduit and containing a cut-ofi' valve, a pneumatic action including a valve chamber connected with said cut-ofil chamber, a valve controlling the exhaustion and flushing of said chamber and a diaphragm controlling said valve, an 'atmospheric conduit leading to said diaphragm, a valve applied to the lastnamed conduit and shifting pneumatics for the last-mentioned valve controlled by the valve mechanisms of said playing pneumatics. i

LOUIS S. LOCKWOOD.

Copies of this patent may be obtained for dve cents each, by addressing the Commissioner of Patents. Washington, D. C."

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