US2044072A - Typewriting machine - Google Patents

Description

- June 16, 1936. G NG 2,044,072

TYPEWRITING MA CHINE Filed Feb. 27, 1953 3 Sheets-Sheet 1 June 16, 1936, e. G. some TYPEWRITING MACHINE Filed Feb. 27, 1933 3 Sheets-Sheet 2 INVENTOR J WITNESSES Filed Feb. 27, 1935 3 Sheets-Sheet 3 ATTORNEY atented June 1a, 1936 144.01: rmwarrmc moms George G. can, Glenbrook, Stamf Bemingtm'lnewrita assignor to Dion, 8. Y.', a corporation of New York Application February 21, ms, Sela] Na. am is cum. T (Cl. 197-153) My invention relates to typewriting and'like machines and more particularly to means for eifecting negative imprints on work sheets.

Tihe machine of my present invention was de- 5. signed more particularly for typewriting original sheets for use in the Standard new process dupli- "ator. In said duplicator" from one hundred to ne hundred and fifty clear copies are made direct from one original typewritten sheet without 1'0 the use of gelatine, stencil or other transfermedium than isinvolved in producing ,the original copy with the aid of a so-called helrtograph carbon" ribbon. The original copy is clamped to the drum of the Standard new I process duplicator i5 and copies can be made therefrom at the rate of about fifty per minute.

As each sheet to be copied is fed forward in the above mentioned duplicating machine, the surface of the sheet becomes slightly moistened 30 with a special chemical solution. This moistened sheet comes into contact with the negative original and a positive copy is produced on the sheet. The copy is then automatically delivered into a receiving tray; Immediately after the copy is produced the chemical solution evaporates from the sheet so that when the copies are removed from the tray they are dry and ready for immediate use.

Heretofore the originals have been produced 50 on a'typewriting machine with the aid of socalled hektograph carbon sheets." a

One of, the main objects of my invention is to I dispense with the use of these so-called hekto- M graph carbon sheets and to provide a highly effective machine in which the originals may be rapidly and effectively produced with the aid of so-called hektographcarbon ribbon and with a saving of o'ver fifty per cent in the amount of hektograph carbon" material used.

40 To the above and other ends which will hereinafter appear my invention consists in the features of construction, arrangements of parts and combinations of devices set forth in the following description andparticularly pointed out in the appended claims. 7

. In the accompanying drawings wherein like reference characters indicate corresponding parts inthe various viewsz I 50 Figl 1 is a detail, fragmentary, perspective view of the means of supporting and feeding the hektograph ribbon. I I J Fig. 2 is a detail, fragmentary, fore and aft,-

vertical, sectional view of the machine embodying 5 the devices of my inventi Fig. 3 is adetaiL-toprianviewof a portion of the feed mechanism for the hektograph ribbon.

Fig. 4 is an enlarged, detail, fragmentary, vertical, sectional view taken on the line 1-4 of Fig. 3 and looking in the direction of the ar- 5 rowsat said line.

Fig. 5 is an enlarged, detail, fragmentary, sectional view of the hektograph ribbon feeding mechanism taken on the line 5-5 of Fig. 3 and looking in the direction of the arrows at said line.

Fig. 6 is an enlarged, detail, fragmentary, ver-' tical, sectional view taken through the platen and showing some of the associated parts.

Fig. 7 is a fragmentary, face view of the work sheet with positive imprints on the front face thereof.

Fig. 8 is a rear view of the same work sheet with the same characters imprinted thereon in the reverse or negative.

Fig. 9 is an enlarged, detail, fragmentary, vertical sectional view taken through the printing point and showing the work sheet and ribbons at the time a pressure imprint is being effected.

I haveshown my invention embodied in the present instance in a #6 Remington noiseless typewriting machine in which the novel devices of my invention may be readily embodied without modifying or materially modifying the existing structural features of said machine. It should so be understood, however, that I am not restricted to the embodiment of the invention in the machine referred to, but that said invention may be employed in various styles of typewriting and like machines wherever found available.

In the accompanying drawings I have shown only so much of the #6 Remington noiseless machine as is deemed necessary to disclose my present invention in its embodiment therein.

The frame of the machine comprises side plates II. The usual type actions are employed including the key levers H, type bars I! and inter-, mediate actuating connections (not shown) controlled by the links it.

The carriage .in the main is of the usual con- .struction and comprises end plates l4 fixed to a cross bar II supported by anti-friction rollers II on a supporting bar H which constitutes part of the case shift frame. 'lhis frame is guided by II and is controlled from case shift keys (not shown) through the links I! in the usual manner. A cylindrical platen 2| is mounted in the carriage andi'eed rollers II and Hand a paperapron'nali oftheusualconstructiommay beemploysd. 'iheusualpeperfingers andpaper ball (not shown) are or may be employed, as well as the usual line gage and card guide ll carried by the case shift frame.

The ordinary automatically actuated ribbon vibrator 24 (Fig. 6) which carries an inking ribbon 25 is used in the present construction, and

by which positive imprints are produced on the.

front face of a work sheet 26, as indicated in Fig. '1. p

In order to simultaneously eflect negative im- I prints on the rear side of the same work sheet 26, as shown in Fig. 8, or on a second work sheet if desired, I employ a second narrow ribbon 21 constructed, arranged and controlled in a manner which will now be described.

The ribbon 21 is preferably a so-called hektograp paper ribbon and is" inked only on the front face thereof for effecting a negative imprint on therear side of a work sheet, as shown in travel of the carriage with the work sheet carried thereby without interference from the ribbon 21 or the parts which support and control it. This ribbon 21 passes through a ribbon guide ,28 that extends substantially throughout the straight stretch of ribbon and partly surrounds the latter. Thus, the guide 22 is secured at 29 to upright bracket arms ll which project from brackets 21 that are secured by screws to the case shift frame, or to the supporting bar l1 which constitutes a part thereof. It will thus be understood that the ribbon guide 2| is fixedly supported by the case shift frame to move with the latter in its case shifting movements and thus present thehektographribbon 21 to the printing point in either case positions of the platen. The ribbon guide 28 is substantially U-shaped in cross section to receive and guide the hektograph ribbon 21 and prevent it from being deflected upwardly or laterally by the work sheets asthey are fed forward in the machine. The substantially U-shaped formation of 'the ribbon guide 28 extends throughout the length thereof except .at and near the printing point. where a single enlarged guide surface 34 is presented. This guide surface has an elongated aperture 35 formed therein at and near the printing point to enable the type bars to press the rear surface of the work sheet against the. front face of the hektograph ribbon at a point where the uninked back of said ribbon bears against the platen, as shown in Fig. 9. The guide surface 34 of the ribbon guide is bent to conform substantially to the curvature of the platen andpreferably bears against same at the upper and lower end portions of said guide surface, as indicated in Figs. 2 and 6 to insure the feed of the work sheet 26 to the front of the ribbon 21 as will hereinafter more clearly appear.

this ribbon on the rear side of a work sheet. The

hektograph ribbon is carried by a spool 36 free to turn on an upright fixed spindle 31. The upper flange of this spool may be made removable in order to place the roll of ribbon on the spool.

The ribbon 21 passes from the spool over a flanged guide pulley 38 carried by a pivoted supporting member II that also constitutes as'upport'for the ribbon spool It." This supporting member I! is pivoted at II on a bracket secured by screws 42 to one of the side plates I ll of the frame. After passing the guide pulley 38 the ribbon-21 extends through the guide 28 to a second flanged guide pulley 43 supp rted on a bracket arm 44 that forms part of a support 45 pivoted at I to a bracket 41 which is in turn secured by screws 4| to the opposite side plate ll of the frame.

It has been explained that the ribbonguide 2| is connected to shift with the case shift frame in the case shifting movements of the latter. In

orderthat the pivoted supports 39 and 45 together with the parts carried thereby may be shifted with the platen in the case shifting movements of the latter I have provided two supports I! and ill each of which is connected to and pro- Jects forward fromthe front face of a bracket arm 30. These supports 49 and Ill coact with and support rearwardly projecting arms and 52 which extend from the supports 45 and 38 re-, spectively. ports I! and 45 will partake of the movement of the case shift frame and in such movements will turn on their pivots so as to maintain all parts of the hektograph ribbon in the same plane at all times irrespective of the case position of the platen. This insures the free travel-and feed of the hektograph ribbon at all times.

As the hektograph ribbon passes from the guide pulley "it is received between and is fed by two cooperative feed rollers 53 and 54, the

It follows from this that the suD- latter being'a flanged roller between the flanges of which the hektograph ribbon and the roller 58 are received.' These rollers 53 and 54 are preferably serrated in order to eifectlvely grip the ribbon 21. A ratchet wheel 55 is flxedly connected to the feed roller' 54 to turn the latter and effect a feed of the ribbon from the supply spool 26.. This ratchet wheel and the feed roller 54 are supported on a spindle 56 carried by the support 4!. The feed roller 52 on the other hand is supported on the arm 51 pivoted at 58 on the arm 44 of the support 45. A contractile spring I! is connected at one end to the arm 51 and is anchored at its opposite end to a pin 60 carried bythe support 45. The effective force of this spring is therefore exerted to press the feed roller 52 against theied roller 54 and against the rib bon 21 interposed between the two feed rollers.

In order to effect a step-by-step feed of the ribbon 21 in the direction of its length, I provide automatically actuated means which coact with the ratchet wheel 55. These means comprise a pawl 6| carried by a pawl carrier 6| pivoted at B2 'to an actuating arm' 63. A contractile spring 64 is connected at one end to the pawl-carrying member 6i and is anchored at its opposite end to a pin 65 carried by the member 63. The effective force of this spring is exerted to move the pawl 6| into engagement with the tooth of the ratchet wheel 55, it being understood that there is sumcient play at the pivotal connection 62 to enable the pawl carrier to swing laterally as well as to receive a pivotal movement around the axis of the pivot 62. As best shown in Figs. 3 and 5 P the pawl carrier 6| carries a pin on which an anti-friction roller i i-is supported, said roller bearing against the-support. and thereby supporting the rear end of thepawl carrier in its feed movements. Projecting tothe left and then r rearward from the pawl carrier is a contact member s1 whichattheendofthefeedmovementof the pawl from the dotted line to the full line position shown in Fig. 8 will be brought into contact 5 with a tooth of the ratchet wiseel il -and prevent an overthrow of the ratchet wheel., a a

' It will be understood that'due to the pivotal sonnection l2 between the pawl carrier and the actuating member ll said pawl carrier may par- 10 take of the case shifting movement of the platen and with the supporting plate or member II. as

also do the members I, H, II, II, II, and I1 cartied by said member II. a

The member 83 is adJustably connected to one 1 arm of an angular lever ll pivoted on the outer end of a supporting pin ll! secured to the lefthand side plate ll of the frame. The adjustable connection between the member 03 and themgular lever 62 is eii'ected by pivoting the member 20 62 at 69 to the angular lever. A slot 12 is provided in the member 63 and through this slot extends ascrew bolt 1| that is received in an opening in the upper end of the angular lever; a nut 12 coacting with the screw bolt to maintain the mem- 25 ber 62 in any position to which it may be adjusted around the pivot 6!. A tightening of the nut 12 retains the member I in fixed relation to the angular lever and in its adJusted position thereon. The effect of this adjustment is to increase 30 or decrease the extent of lost motion transmitted by a screw 19 or'otherwise with the usual univer sal bar Ill. Each key lever II in the actuation of p a type action depresses the universal bar II and transmits motion through the train of COMBO-n 45 tions described to the pawl to effect an intermittent rotation of the ratchet wheel I, thus erfecting a step-by-step feed of the ribbon 21. a'

small extent of feed being effected at each. print- 56 ingoperation or at each depression. of a printing key. 1 I Y 1 As the free used end portion of the ribbon 21 is fed forward from the feed rollers II, it is torn oi! i'romtime to time as the hektograph ribbon is used but once.

,1twillbeseenthatbytheuseofthefeed.

rollers 53 and It to feed or advance the licktosraph ribbon such feed is -always uniform for any given adjustment of the member I I, and the feed does notvaryasinthecasewhenearibboniswound 60 onto a s ool and the extent of feed varies with the amount of ribbon wound thereon.

From a consideration of Fig. 4 it---will be understood that each of'the supporting members ll and it is adjustably connected to the companion 65 bracket-arm II by a screw .and slotconnection,

each bracket arm Il-being slotted at It to headed screws 22. By loosening .the screws 22 snap and down adjustment of thecompanisn 70 supporting member 40 or Il. may be elected. Whenthe associated screws are tightened the supporting member it or ll is secured in its adiustedpositlon.

In the operation of thelmachinea won: sheet a 75 2tisintroducedat the rear or introductory side oftheplatenandis fedforwardpasttheprinting line-by a rotation of the platen. The enlarged portion ll of the ribbon guide 20 togetherwith the paper apron and the usual card guide and line indicator .3, a fragmentary portion of which is shown in Fig. 6, insure thqfeed of the paper forward of the ribbon 21 and between said ribbon and the regular vibrator-carried ribbon 25. This insures bringing the paper into such position that a positive imprint may be effected on the front face of the work sheet by the ribbon 25 and a simultaneous negative imprint is produced on the rear side of the same work sheet by the hektograph ribbon 21. It will be understood that the guide 20 protects the ribbon 21 against lateral deflection and insures the prop er feed of the work sheet to bring the rear side thereof into cooperative relation with the front face of the hektograph ribbon. The guide also prevents the rear side of the work sheet from being smudged by-the inked side of the hektographribbon as the work sheet travels with the carriage relatively, to said ribbon.

I am aware that with my machine it is possible to employ two work sheets at a time to be fed simultaneously through the machine in the same manner as a single sheet 28, as 'hereinbefore' described. In this event the front sheet would receive the positive imprint on the front face thereof from the ribbon 2|. whereas the rear sheet from which the hektograph copies are to be made would receive a negative imprint on the rear dde thereof from the hektograph ribbon 21. However, this would result in a waste of paper and a possible subsequent loss of identity between the two companion sheets. I therefore, in practice, prefer to employ a single sheet 26 having a positive imprint on the "front face thereofvand a negative imprint on the rear side thereof. This enables the operator to examine the positive copy as the work proceeds and affords an assurance that the hidden hektograph copy is comet or en ables her to readily discover any mistakes that have been made and correct them.

1 also am aware of the fact that the regular ribbon 28 may be thrown out of use by means of the ordinary stencil control, for example, in which event a negative imprint only would be produced on the rear side of the work sheet. I prefer, however. to simultaneously effect a positive imprint on the front face of the work sheet as well as a negative imprint on the rear side of the work sheet for reasons which will be obvious from what I hasbeen pointed out above. I From'certain aspects oi my invention either of the above mentioned uses of my machine may be considered within the purview of my invention.

Various changes may be made in the construction, and certain features thereof may be emplayed without others, without departure from myinvention as it is defined in the accompanying claims 'Whaticlaimasnew and desireto secureby LettersPatent is:

1. In a typewriting or like machine, means for simultaneously printing on opposite sides of work sheets, the imprint on one side being positive and. the imprint on the other side. being negative, said means comprising a carriage, a cylindrical platen carried thereby and by. which the work sheets arelinespacedwhentheplatenisturned,aribhon having a coating only on the front side thereof for printing from its front side 'only on the tearsideofaworksheet,asccondribbonforsimultaneously printing from its rear side on the front face of a-w'orksheet, means for-guiding the work sheet or sheets between said ribbons so that he work sheets will not have to be threaded by -hand to such position, printing instrumentalities,

automatically operating means actuated at each operation of a printing instrumentality for effecting a feed of said first mentioned ribbon, and adiustable means for varying the feed of the ribbon by said automatically operating means to any one of a number of different fixed extents in accordance with the setting of said adjustable means. 7

2. In a typewriting or like machine, means for simultaneously printing on opposite sides of work sheets, the imprint-on one side being positive and the imprint 'on the other side being negative, said means comprising a carriage, a cylindrical platen carried thereby and by-which the work sheets are line spaced when the platen is turned, a ribbon coated with a copying ink on its front side only for printing from its front side on the rear side only of awork sheet, a, second ribbon for simultaneously printing from its rear side on the front face of a work sheet, and a guide carried by the frame of the machine and fixed against traveling movement with the carriage, said guide being substantially U-shaped in "cross section in the rear. of the work sheet and equal in length to the travel of the carriage and through which said first mentioned ribbon is fed.

3. In a typewriting-or like machine, means for simultaneously printing on opposite sides of work sheets, the imprint on one side being'positive and the imprint on the other side being negative, said means comprising a. carriage, a cylindrical platen carried thereby, a ribbon for printing from its front side on the rear side of a work sheet, a-

second ribbon forsimultaneously printing from its rear side on the front face of a .work sheet, and a guide carried by the frame of the machine and havingan opening therein at and near the I printing point, said guide being substantially U-:

shaped in. cross section except near the printing point where said opening is located therein, said guide receiving and guiding the first mentioned produced on the front face of a worksheet and a negative imprint will be simultaneously produced from the copying ribbon on the rear side of a work sheet to enable numerous positive copies to be made therefrom, means for eii'ecting a case shift movement of the platen, a ribbon spool carried by the frame of the machine and fixed traveling movement with the carriage andon which said copying ribbon is carried, and means for shifting saidribbonspool with the platen in the ease shifting movements of the latter. .5. In a typewriting or like machine, the combination of printing instrumentalities, a carriage, a cylindricalplaten carried thereby and by which the work sheets are line spaced when the platen k turncdwa ribbon vibrator, a ribbon h r ribbon rearr and through'said-guide.

' for guiding one or more work sheets ofpthe first mentioned ribbon and coated only on the front face thereof-with a cop ink, means for guidingone or more work sheets intermediate said ribbons, whereby a positive imprint will be produced on the front face of a 5 work sheet and a negative imprint will be simultaneously produced from the copying ribbon on therear side of a work sheet to enable numerous positive copies to be made therefrom, and a guide' -for and. that partly surrounds said copy ribported in the rear of the first mentioned ribbon and coated only on the front face thereof with a copying ink, means for guiding one or more work sheets intermediate said ribbons, whereby a positive imprint will be produced on the front face of a work sheet and a negative imprint will be simultaneously produced from the copying ribbon on the rear side of a work sheet to enable numerous positive-copies to be made therefrom, a supply spool for the copying ribbon carried by the frameof the machine and fixed against traveling movement with the carriage means for shifting said supply spool with the platen in the shifting movements of the latter, andautomatically' operating means actuated at each w printing operation for feeding said copying ribbon off the supply spool.

'7. In a .typewriting or like machine, the combination of printing instrumentalities, a carriage, a cylindrical platen carried thereby and by which the work sheets are line spaced when the platen- 40 is -turned,' a ribbon vibrator, a ribbon carried thereby, a copying ribbon supported in the rear of the first mentioned ribbon and coated only on the front face thereof with a copying ink, means for guiding one or more work sheets intermediate said ribbons, whereby a positive imprint will be produced on the front face of a work sheet and a negative imprint will be simultaneously produced-from the copying ribbon on the rear side 7 of a work sheet to enable numerous positive copies to be made therefrom, a guide for and that partly surrounds said copying ribbon and that is, held against traveling movement with the carriage and is positioned to receive the work sheet or sheets infront thereof, a supply spool forthe copying ribbon, and automatically operating means actuated at each printing operation for feeding said copyin ribbon off the supply 8. In a typewriting or like machine, the combination of'printing instrumentalities, a carriage,

' a cylindrical platen carried thereby and by which the work sheets are line spaced when the platen is turned, a'ribbon vibrator, a ribboncarried 7 thereby, a copying ribbon supported in the rear of the first mentioned ribbon and coated only on v the front face thereof with a copying ink,- means intermediate said ribbons, whereby a positive imprint will be produced on the front faceof a work sheet anda negative imprint will be simultaneously produced from the copyin ribbon on the rear side 'of a work sheet .to' enable numerous positive copies to be made therefrom, meansfor effecting a case shifting movement of said platen, a guide carried by the frame of the machine and fixed agai st traveling movement with the carriage and which extends lengthwise of the platen and receives said copying ribbon, means for shifting said guide with the platen in the case shifting movement of the latter, and automatically operating means for feeding said copying ribbon at each printing operation.

9. In a typewriting or like machine, the combination of a case shiftable platen, two supports pivoted to the frame of the machine, a ribbon feed mechanism mounted in part on one of said shifting movement.

supports and partaking in the pivotal movement thereof, a ribbon supply spool mounted on the other of said supports and partaking in the pivotal movement thereof, means for effecting a pivotal movement of said supports when the platen receives a case shifting movement, a ribbon guide carried by the frame of the machine and which coacts with the ribbon as it passes from said supply spool to said ribbon feed mechanism, and means for shifting said guide with the platen in the case shifting movements of the latter.

10. In a typewriting or like machine, the combination of a case shiftable platen, two supports pivoted to the frame of the machine, a ribbon feed ratchet wheel mounted on one of said pivoted supports and partaking in the pivotal movements thereof, means for turning said ratchet wheel, a ribbon feed roller driven by said ratchet wheel, a second ribbon feed roller spring pressed against said first mentioned feed roller. and against the ribbon received between said rollers, a ribbon supply spool mounted on and partaking in the pivotal movement of the other of said supports, and means for shifting said supports on their pivots when the platen receives a case 11. In a typewriting or like machine, the combination of a case shiftable platen, two supports pivoted to the frame of the machine, a ribbon feed ratchet wheel mounted on one of said pivoted supports and partaking in the pivotal movements thereof, means for turning said ratchet wheel, a ribbon feed roller driven by said ratchet wheel, a second ribbon feed roller spring pressed against said first mentioned feed roller and against the ribbon received between said rollers, a ribbon supply spool mounted on and partaking in the pivotal movement of the other of said supports, means for shifting said supports on their pivots when' the platen receives a case shifting movement, a ribbon guide that partly surrounds the stretch of ribbon intermediate the supply spool and ribbon feed rollers, and means for causing said guide to partake 'in the case shifting movement of the platen.

12. In a typewriting or like machine, the combination of a carriage, a case shiftable platen carried thereby, printing instrumentalities, and means for eifecting a negative imprint in copying ink on the back 'of a work sheet to enable numerous positive copies to be made therefrom, said means comprising a ribbon inked with a copying ing movement with the carriage, means for shifting said guide with the platen in the case shifting movements of the latter, means for feeding the ribbon through said guide, and means for directing a work sheet in front of said guide.

13. In a typewriting or like machine, the combination of a carriage, cylindrical platen carried thereby and by which the work sheets are line spaced when the platen is turned, a case shift frame by which the platen receives case shifting movement, a ribbon inked with a copying ink only on its front face, a ribbon guide that partlysurrounds the ribbon and is carried by and shifts with said case shift frame and is fixed against traveling movement with the carriage, means for directing work sheets in front of said ribbon guide and thus enable negative printingto be effected on the rear side of a work sheet, and automat-.

movement, a copying ribbon inked only on its front face, whereby negative imprints are produced only on the rear side of a work sheet to enable numerous positive copies to be made therefrom, a ribbon guide that partly surrounds the ribbon and is carried by and shifts with said case shift frame and is fixed against traveling movement with the carriage, means for directing work sheets in front of said ribbon guide, and automatically operating means for feeding a ribbon through said guide at each printing operation, said ribbon feeding means comprising a universal bar actuated at each printing operation, and ribbon feeding devices controlled by said universal bar.

15. In a typewriting or like machine, the combination of a carriage, cylindrical platen carried thereby and by which the work sheets are line spaced when the platen is turned, a case shift frame by which the platen receives case shifting movement, a ribbon guide that partly surrounds the ribbon and is carried by and shifts with said case shift frame, means for directing work sheets in front of said ribbon guide, and automatically operating means for feeding a ribbon through said guide at each printing operation, said ribbon feeding means comprising a universal bar actuated at each printing operation, ribbon feeding devices controlled by said universal bar, and means for shifting certain of said ribbon feed devices with the platen in the case shifting movements of the latter.

16. In a typewriting or like machine, means for simultaneously printing on opposite sides of work sheets, the imprint on one side being positive and the imprint on the other side being negative, said means comprising a carriage mounted for case shifting movement, a cylindrical platen carried thereby and shiftable therewith and by which the work sheets are line spaced when the platen is turned, a ribbon coated with a copying ink on the front side only thereof for printing from the front side only of the ribbon on the rear side of a work sheet, a ribbon spool on which said ribbon is wound, said ribbon spool being carried by the frame of the machine against traveling movement with the carriage, means for shifting said ribbon and ribbon spool with the platen in the case shifting movement of the latter, a second ribbon for simultaneously printing from its rear side on the front face of a work sheet, and means for guiding the work sheet or sheets between said ribbons so'that the work sheets will not have to be threaded by hand to such position.

GEORGE G. GOING.

CERTIFICATE or CORRECTION.

Patent No. 2,o44,o72. June 16, 1936.

GEORGE 0'. come.

It is hereby certified that error appears in the printed specification of the above numbered patent requiring correction as follows: Page 5, second column, line 14, claim 13, after the word "sheet" and before the comma insert and enable numerous positive copies to be made therefrom; and that the said Letters Patent should be read with this correction therein that the same may conform to the record of the case in the Patent Office.

Signed and sealed this 16th day of March, A. D. 1937.

- Henry Van Arsdale Seal) Acting Commissioner of Patents.

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