US1558720A - Controlling and braking device for ships' gyroscopes - Google Patents

Description

Oct. 27, 1,558,720

H. H. THOMPSON CONTROLLING AND BRAKING DEVICE FOR SHIPS GYROSCOPES Filed y 25, 1917 2 sheets-sheet; 11.

0a. 27,1925. 7 1,558,720 H- H. THOMPSON CONTROLLING 'AND BRAKI NG DEVICE FOR SHIPS GYROSCOPES i July 23, 1917 2 Sheets-Sheet 2 Patented Oct. 27, 1925.

, UNITED STATES PATENT OFFICE.

HERBERT H. THOMPSON, OF BROOKLYN, NEW YORK, ASSIGNOR TO THE SPER-RY GY RO- SCOPE COMPANY, OF BROOKLYN, NEW YORK, A CORPORATION OF. NEW YORK.

CONTROLLING 'AND BRAKING DEVICE FOB/SHIPS GY'ROSCOPES.

Application filed. July 23, 1917. 1 Serial No. 182,189.

To all whom it may concern:

Be it known that I, HERBERT I-I. Ti-roivrrsoN, a citizen of the United States of America, residing at 1487 East 18th Street, Brooklyn, in the county of Kings and State of New York, have invented certain new and useful Improvements in Controlling and Braking Devices for Ships Gyroscopes, of which the following is a specification.

This invention relates to large gyroscopes such as employed to stabilize or roll ships. The control of gyroscopes of this size and character has been found very difficult owing to the enormous forces involved and the necessity for bringing the gyroscope to rest at least twice during each roll of the ship. Difficulty has also been experienced in lim iting the speed of the gyroscope. Another objection to such gyroscopes has been the large amount of power they require, both to drive the rotor and to control its oscil1ations. 1

In order to control and successfully brake its oscillations, powerful brakes have been employed which waste a great amount of energy and produce a large amount of heat which it is necessary to dissipate.

The purpose of this invention is to obviate the necessity for such wasteful brakes or at least for brakes of such large capacity and to make use of the force heretofore wasted in braking the gyroscope in assisting in driving the rotor of the gyroscope.

Electricity is now considered the preferred manner of driving such gyroscopes as illustrated in my invention for electricallydriven gyroscopes.

My invention is also equally well adapted to either the so called passive or Schlick type stabilizer, or the active or Sperry type of gyroscope.

This invention also has application to stabilizing devices for ships of other than gyroscopic character, since in all such devices, the problem of accelerating and decelerating a moving mass during the comparatively short rolling cycle of the ship is an important one.

Since in illustrating and describing the application of my invention to an active gyroscope, its application will at once be apparent to the passive gyroscope I have chosen the former device to illustrate the invention. 1

Referring to the drawings in which what I now consider to be the preferred forms of my invention are shownr Fig. 1 is a front elevation partly in section of an electrically driven gyroscope as mounted on a ship. 1 i i Fig. 2 is side elevation of thesame, the direction of the fore and aft line of the ship being indicated by the arrow.

Fig. 3 is a diagram illustrating the preferred form of my invention.

Fig. l is a side elevation of a control gyro used in connection with an active type of stabilizer. i l i Fig. 5 is a detail ofthe speed control device of the gyroscope. T

Fig. 5 is a front view of the contacts thereon.

Fig. 6 is a wiring diagram of a modified form of the invention.

Fig. 7 is a diagram of the second modification.

In Figs. 1 and 2 the gyroscope is shown as comprising a casing 1 in which is journaled in vertical bearings 2 and 3,,the rotor l of the gyroscope. The casing or rotor bearing frame is mounted for oscillation on normally horizontal trunnions 5 and 6 supported by heavy brackets 7 and 8 on the floor of the ship. Trunnions 5 and G are preferably placed athwarthships as indicated in Fig. 2 by the arrow L representing the fore and aft line of the ship. The gyroscope is shown as driven by placing on the rotor shaft an armature 9 of an electric motor, the field 10 being supported from casing 1. i

In the form shown, the motor is. illus trated as a direct current motor. If desired, a second motor 11 may be provided, although this second motor is not necessary in the preferred form of my invention. The oscillations of the gyroscope about trunnions 5 and 6 are controlled by a motor or other translating device 12 which is shown as geared to the casing by pinion 13 on the motor shaft and a large gear sector i l 'on the gyro casing. l

is: H

with the strip 18 when the precession stops.

The main gyro is also provided with a limit device or stop. Said device isshown as an arm or trolley 26 mounted on casing 1 and adapted to contact with and slide across contactsectors 27 and 28 positioned at predetermined angles to the vertical. The said device governs in partthe operation of the motor 12 supplementing the action of the control gyro in thisrespect.

The motor .12 is adapted to becontrolled from the auxiliary control gyroscope 19, Fig. 41. The said gyroscope is shown as mounted for precession. about avertical axis 20 by ring 100, the rotor being enclosed within thecasing 21 and mounted on a hori- 'zontal spinning ,axis. The spinning axis of the gyroscope is placed athwartships as indicated by the arrow B. As soon as the ship starts to roll in one direction or the other, the precession -o't the control gyro will move the contact 22 mounted thereon intocontact with either one or theother of relatively stationary points .23 or 24: and complete the circuits hereinafter described.

Takinguplfirst, the .form of the invention shown in Fig. 6, motors 9, 11 and 12 will at once be recognized, the control gyroscope being represented at 19 and thestabilizing gyroscope at 1. AlLtheelectricalzapparatus is shown as actuated from a supply. line S S'- The contactwpoints 22, 23 and 2% on the control gyroscope are in circuit with the windings 30* and 31 of double relay 32, by

means of which, or equivalent'device, the motor 12.is reversed. If-points .22and 24 come in contact current is sent through winding 30 which .throws points 35.-a1id S6 bf the relay into contact andalso' points 87 and 38, thereby completing a circuit through the armature 40 of motor 12 in'one direc-v tion with respect to themain field winding 41. 'VVhen points ;22 and .23 contact, however, the circuit is made through coil 31 of the relay thereby causing points 43, 44-, 4:5 and 46 to come into engagement, thereby reversing the armature with respect tothe field.

In order to limit the speed of precession, I prefer to cause machine 12 to act as a generator and aid in driving the rotor in that manner. To aid the machine to so function, the separately excited field thereof may be strengthened, when the precession speed exceeds a predetermined value. To eiiect this purpose a series coil 18 may be employed which is placed in series with the "and 24B and solenoid 67 armature. A pivoted armature 4-9 is held against the core of said coil and against the action of the spring 50 as long as sullicient current flows through the coil. Vhen, however, the armature current fallsbelow a predetermined value or when in other words, the speed of the motor becomes too high, the spring 50 withdraws armature 49 and completes the contact with point 51 thereby throwing into circuit an auxiliary ield 52 on motor 12 and increasirig the strength of the field. By this or equivalent means, the counter 'electro-motive force of the motor is raised sothat its speed will be reduced; and if the speed of precession is sui'iicient, it willbe converted into a generator, and act tozassist in drix' ing the motor 9, by forcing current back into line. at the same time a braking effect will be exerted on the gyroscope.

Then the stabilizing gyroscope ap proaches the limit of its oscillation in any direction, means are employed to exert a maximum braking force on the gyroscope so as to bring it to rest. Contacts 26, 27 and 28 bring into operation such ameans. To effect this I. prefer to disconnect motor 12 from the main line. Asshown, contact 28 is in circuit with an electromagnetic coil 55, while contact 27 is in. circuit with corresponding coil 56. The said coils are arranged'to attract armatures and 71 respectively, which are normally held away from the coils by springs59. The said ar matures act as switches, being normally held in engagement with their complementary switch portions 7273 by said springs. Said switches are placed between contacts 23 hereinafter described.

At the same time, a circuit is completed to cause machine .12 to actas agenerator'to furnish a powerful current to'aid in driving the rotor. In this form. of the invention the machine 12 isthrown into circuit with motor 11 on the gyroscope. .Motor 11 is preferably designed with a very low resistance and low counter electro-motive force so that machine 12 being driven by the precession of the gyroscope will act as a generator to drive motor 11?, thereby assisting in driving the motor 11 and at the same time exerting apowerful braking effect on the gyroscope. In order to effect this purpose I haveshown a switch 62 designed to place the dynamo electric -ma-- chines 11 and 12 incircuit when either contact 27 or 28 is made and to break the main line circuit. An electromagnet 63 is shown as in circuit with both-of said contacts and serves to draw switch point 6 1 into contact with point 65, when either of said contacts is completed. :Point 6 1 is normally held in contact with 66 which connects the motor across the line by an electro-magnet 67, in

circuit with contacts 22, 23 and 24: and also with contacts 70, 71 and 7 2, 7 3. 'A spring 68 may also beemployed. Resistance coils 69 are shown in circuit with magnet 63 to indicate that it is weaker than magnet 67 The action of limit switches in causing the gyroscope to stop is as follows. Let us suppose that the ship is rolling so that gyroscope 19 has processed to bring 22 against 2 1. As the roll continues contacts 26 and 27 will be brought into engagement. This will cause the excitation of coil 56 and break the circuit through magnet 67 at points 71, 73. Magnet 63 will also beexcited, which will break the main circuit at (3 1, 66 and close a circuit between machines 12 and 11 at 64, 65. When the ship starts to roll back contacts 22 and 23 will close, causing relay 32 to reverse the motor. Also since switch 70, 72 is closed, switch 64 will move down against 66, as magnet 67 is the stronger, thereby again driving machine 12 as a motor, but in the opposite direction.

In the preferred form of the invention shown in Fig. 3, the necessity for employing an additional motor 11, is dispensed with, altho two motors, acting as one may be employed, if desired. According to this form, the precessionmotor 12,. when the limit switch on the main gyroscope, is reached, is thrown from its normal connection across the line to a series connection with the line and at the same time the connection between the field and armature reversed. By this or an equivalent arrangement the said machine 12 is converted in el'lect into a booster, furnishing current to the supply line and in that manner helping drive the motors 9 and 11 and at the same time acting as a powerful brake to bring the oscillations of the gyroscope to rest.

One method of carrying out this purpose is illustrated in the wiring diagram, the parts being numbered correspondingly to the parts in Fig. 6. I

It will be seen that the contacts 22, 23, 24: on the control gyro 19 are again in circuit with a relay 32. Also in circuit with said relay, are contacts 26, and 81 on the main gyroscope. Additional contacts 27 and 28' may also be provided on said gyroscope which are in circuit with magnet winding 82, and solenoids 90 and 91, respectively. Said magnet when excited attracts the armature 83 thereby moving a plurality of connected switches 84. Said switches are normally held in the downward position by spring or similar means, and also by a solenoid 182 having windings in circuit with contacts 22, 23 and 24:. In the said downward position the armature 10 of motor 12 is across the line and the motor under the control of the auxiliary gyro. When, however, contact is made with 27 or 28, the

switches aremoved and contact broken at the main circuit SS. The field 11, as in the other form is separately excited, to secure a maximum braking efi'ect.

Between the contacts 23 and 24; and the relay coils 30 and 31 and also solenoid 182, I prefer to place interrupting switches 92 and vSaid switches are normally held closed by springs 94 but are opened when the adjacent solenoid or 91 is excited. Resistances 69 are shown between contacts 80 and 81 and the relay 32 and also in circuit with winding 82 to indicate that the circuit therethrough is weaker than the circuitfrom the contacts 23 and 2e.

In this figure I have also shown a modified form of speed limiting device. According to this form I make use of the mechanical governor 15 described above which moves a contact 16 into engagement with the contact or strip 17 when a maximum speed is reached thereby closing a circuit through an auxiliary field winding 52 and increasing the counter-electro-motive force of the preces sion motor 12 as herein before described.

I also find it desirable to throw out the control from the main gyroscope when said gyroscope is brought to rest, so that it will not be reversed until reversed by the auxiliary gyroscope. For this purpose the cir cuit through contact 26 is broken. This may be effected by arranging contact 16 so that it will roll off contact 18 when the centrifugal governor is stopped (see Fig. 5) thereby deenergizing the relay. As the relay is normally held in the open position by springs 150 and 151, this will open the armature circuit. I

The operation of this form ofthe invention for bringing the gyroscope to rest is as follows: Let us suppose that the ship is rolling and the gyroscope 19 has brought contact22 against 24. As the roll continues contact 26 on the main gyro will be brought into engagement with contacts 27 and 80.

' This will cause a current to be sent through coil 30 and at the same time the circuit from contact 2 1 to coil 31 will be broken at 92 by the exciting of solenoid 90. The relay 32' will therefore break the contacts and 101 and make contacts 102,103, thereby reversing the armature with respect to the field. At the same time winding 82 will be excited and winding 182 deenergized thereby opening switches 88 and 87 and closing switch 89 which will throw the machine in series with the line. As soon as the main gyroscope is brought to rest, however, the

contact .16, 18 will be opened.thereby.throwing out the .precession {motor 12 by'deenergizing coil 30. :As soon as the ship starts to roll back, whether it is before the main gyroscope has been brought to rest or not, contact-s 22and 23 will close, causing the immediate excitation of'winding 30 and the making of contact at 102 and 103-since the circuit through the switch point 93 remains unbroken. At the same time, winding 182 will draw switch 84 down, since it is stronger than winding 82'and is aided by spring 85.

In Fig. 7, my invention is shown as applied to a somewhat diiierent arrangement of apparatus. The modification shown in this figure however, is not claimed specifically in this application, but is reserved for my divisional application, Serial No. 585,407, controlling and braking device for ships gyroscopes, filed August 31, 1922. In this figure the gyroscope is shownas driven from an induction motor 110. Current for this motor and also for the control apparatus is represented as furnished from a turbo generator set or the like 111 comprising an A. C. generator 112, a main D. G. generator 112 andpreferably also an auxiliary D. C. motor 113; alt-houglrthe latter =may be incorporated as a partof the former, if desired.

According to this modification, the armature of motor 12 is directly connected with thearmature 11 1 of generator 112, the reversal of motor .12 being accomplished by reversing the field o'f-the generator 112. In order to accomplish this, the contacts 22, 2S-and 24 on control, gyro 19 are shown as completing circuits from the main D. C. source of supply TT through the oppositely wound field windings 115 and 116 of machine -112. The contacts 26,27 and .28 on the main gyroscope are again placed in circuit with a plurality of solenoids, contact 27 being in circuit with s0lenoid63 and-90, while contact 28 is in circuit with solenoid 68 and 91. The field circuits of dynamo 112 are also carried through windings 118 ,and 119 forming a-solenoid opposed to solenoid'63. In this modification of the invention a speed limiting device similar to the one described in connection with Fig. 6 is shown; comprising a series coil 18 adapted to allow an auxiliary field circuit 52 to be completed at 51 when the strength of the current flowing through the armature falls below a predetermined value.

hen gyroscope 19 precesses to bring circuit between machines-.112 andll2. When 26engages27, however, solenoid 63 will-be excitedfand at the same time the field circuit through solenoid118 will be broken at point 121 by the excitation of magnet 90 This will. throw the switch (id-"into engagement with point 65 thereby disconnecting armature 40 from armature 114 and connecting it to the auxiliary machine 113. The said machine, like machine 11 heretoiore described, is wound for 'low resistance and low counter electromotive'force so that a heavy current will be circulated in the circuit so completed, thereby braking the main gyro and at the same time aidingin driving the gyroscopic rotor by assistingthe prime mover to drive the generator 112 in this instance.

The application of my invention to a passive stabilizer, i. e., one in which the precession is braked but not accelerated will be apparent to those skilled in the art. It used with this system, only the parts shown in Figs. 1 and 2 need be employed, the auxiliary gyroscope together with connected parts being omitted. Dynamo-electric machine 12 would then be controlled entirely from the contacts on the main gyroscope as will be readily 'apparent,"the, armature 10 of machine 12 being open circuited normally by relay 32' (Fig. 3) and connected as a booster orgenerator, to drive said motor on the gyroscope reaching one of thelimit contacts 27 or 28C The speed'limiting device 15 would then preferablybe used to effeet the same or similar connections to'that eiiected by the limit contacts '27, 28 by connecting the switch 16,17 to the same or similar circuit changing relays 32' and 82. In accordance with .the provisions of the patent statutes, Ihave herein described the principle of operation of my invention, to-

.gether with the apparatus, which I now consider to represent the best embodiment thereof but I desire to have it understood that the apparatus shown, is only illust'ative and that the invention canbe carried out by other means. Also, while it is designed to use-the various features and elements in the combination and relations described, some of. these may be altered and others omitted Without interfering with the more general results outlined, and the invention extends to. such use.

Having described my invention, what I claim and desire to secure by Letters Patcut is:

1. In a gyroscopic stabilizer, the combination with a rotor, a motor for driving the same, aprecession engine, power means for drivingsaid' motor and engine and means for causingsaid engine to brake said gyroscope by employingisaid engine to aid in driving the rotor.

.2. The combination with a gyroscope lOS ' mounted for precession about an axis, a

braking means therefor, controlling means for said brake brought into action by a predetermined amplitude of precession of said gyroscope, said braking means including means actuated by precessional movements of the gyroscope for aiding in rotating the gyroscopic rotor.

3. The combination with a gyroscope mounted for precession about an axis, a power absorbing precession engine therefor, controlling means for said engine responsive to a predetermined precession of said gyroscope, and adapted to convert said engine into a power producing means driven by the precession of the gyroscope, and means for utilizing the power so produced to drive the rotor.

' 4. The combination with a gyroscope mounted for precession about an" axis, a dynamo-electric machine for controlling the precession thereof, and a translating device for driving the gyroscopic rotor, current being supplied to said device during a predetermined phase of a precessional oscillation by said electric machine.

5. In a ships gyroscopic apparatus, the combination with a control device and a gyroscope, of a dynamo-electric machine for governing the precession thereof, reversing means for said machine, said means being controlled both by said device and by a predetermined precession of said gyroscope.

6. The combination with a gyroscope mounted for precession about an axis, a dynamo-electric machine for controlling the precession thereof, a translating device for driving the gyroscopic rotor, a power supply for said device and said machine, and means for causing said machine to act as a booster to aid in driving said device at predetermined periods in the oscillation of the gyroscope.

7. The combination with a stabilizing gyroscope, of an electro-dynamic braking means therefor, and means responsive to the speed of precession of said gyroscope for bringing said brake into action.

8. In a gyroscopic stabilizer, the combination with a gyro-rotor, of a motor for driving the same, an electro-dynamic brak ing device for said gyroscope, and means for establishing an electrical connection between said device and motor when said device is active whereby said device assists in driving the rotor.

9. The combination with a stabilizing gyroscope, of an electro-dynamic braking means therefor, and means responsive to a predetermined precession of said gyroscope for bringing said brake into action.

10. The combination with a stabilizing gyroscope, of an electro-dynamic braking means therefor, means responsive to the speed of precession of said gyroscope for means for rendering the limit device, when actuated, controlling as the'ship continues to roll in the direction which caused the actuation of said limit device.

12. In a stabilizing gyroscope for. ships, the combination with a control device, a precession dynamo-electric machine for the gyroscope, a limit device for said gyroscope, a reversing device for said machine controlled from both of said devices, selective means for rendering the limit device, when actuatechcontrolling as the ship continues to roll in the direction which caused the actuation of said limit device, and selective means for rendering the control device controlling when the ships roll reverses.

13. In a stabilizing gyroscope for ships,

the combination with a control device, a

precession dynamo-electric machine for the gyroscope, a limit device for said gyroscope, a plurality of switchesfor changing said machine from a precession accelerating motor to a precession braking generator, electro-magnetic means for controlling said switches governed by both of said devices, and selective means for rendering the limit device, when actuated, controlling as the ship continues to roll in the direction which causes the actuation of said limitdevice.

1 1. In ,a gyroscopic stabilizer for ships the combination with a gyroscope mounted for precession with respect to the ship, of means for limiting the amplitude of precession of the gyroscope in either direction comprising means adapted to transfer the power absorbed in braking said precession to aid in driving the rotor.

15. In combination, a gyroscope and meansadapted, whenever the amplitude of oscillation of said gyroscope exceeds a predetermined amount, to transform energy of oscillation into rotary energy of the gyroscope.

' 16. In combination, a gyroscope and means for causing the oscillation of said gyroscope to rotate the rotor thereof when the amplitude of oscillation reaches a predetermined amount.

17. In combination, a gyroscope, an electrical translating device and means for absorbing energy of oscillation from said gyroscope and for supplying energy to said translating device whenever the speed of oscillation reaches a predetermined amount.

18. In combination, a gyroscope, a translating device and means for absorbing energy of oscillation from: said. gyroscope and for supplying energy to said translating device. whenever the amplitude. of oscillation reaches a predetermined amount.

19aIn combination, a gyroscope, a translating device and means for absorbing. energy: of oscillationtrom saidi-gyroscope and for -supplying.energyto said translating device whenever either the speed or amplitude-of oscillation reaches a predetermined amount:

20. In combination, a gyroscope, a dynamo-electric machine connected thereto, means for causing saidmachine to act as a motor to cause precession of said gyroscope and means for causing saidmachine-to act as a generator to opposeprecession ot'said gyroscope:

21. In combination, a gyroscope, a dynamo electricmachine connected thereto, means for causing said machine to'act as azmotor to cause precession o frsaidfgyroscope and means controlled :by. said gyroscope "for. causing said :niachine-to @act; as a generator to opposerprecessionof said gyroscope.-

22. In combination; a-gyroscope,.aidevice ltor causing'preccssionthereof, a translating device'an'dimeansfor causing said :first mentionedt'deriee to. absorb .energy from said gyroscop'e iand;to supply energy to said second mentioned device.

23. The. combination with a gyroscopic stabilizer, of a spinning motor and JZMPI'ECGS- "=sion motor therefor, a source of power for the motorsrincluding a generator, and'wmeans for varying the relativelicldstrengths of the' precession motor and generator for causing said motor to act asa': generator upon a predetermined portion of the-precessional-Icycler 2a; The combination: with agyroscopio stabilizer, ot a spinning motor and a precession motor theretor, a source: ofrpower vfor the motors,- and: means for: increasing-the field strength of the precession motor for 'causingsaidmotor to "act as a-generator to brake thegyroscope during; the latter portion of ith'e precessional cycle.

25. 'Thecombination with a gyroscope,-of a: common uneans 'for braking; regenerativel-y the prccessional motions to absorb the precessionalenergy" or: the greater portion thereof in'the last part 'and'acceleratingthe I precessional motions in thewfirst partoi the oscillation of the gyroscope, and means for governing said first mentioned-means.

26. Thecombmatmmwrth agyr-oscope, of

a common-means for braking'regeneratively 'tl'ieprecessionalmotions to absorb the p'recessional energy :or: the greater portion thereotinthe last part and limitingthe speed of precession during? the major: part ctthe :preeessional cycleg-andmeans for governing said first mentioned means.

sio-nal motions in the-"last. part, limiting.

the speed of precession during the major part and accelerating the precessional motions-in the first part of the oscillation of the gyroscope, and means for governingsaid first mentioned means.v

28. In a ship stabilizingapparatus, .thecombination-with a moving. part to be accelerated and retarded during a rolling. cycle, of a fly wheel, and means for utilizing the energy generated in retarding said part for rotating said fly wheel. I

29. In a ship stabilizing apparatus, the combination with annovingipartto be. accelerated and retarded during. a rolling cycle, of a fly wheel, mounted-on saidpart, means for rotating said wheel, .and means for utilizing. the energy. generated inure? tardingsaid part tor assistingin rotating said fly wheel.-

80. The'combination with a moving fly wheel of a gyroscopic stabilizer, of electrodynamic means forrotatingsaid wheel, electro-dynamie means for controlling the precession o1": said-stabilizer, and means for transferring energy from said secondlnamed to said first named means. 7 y I '31. In a. gyroscopic stabilizer, the combination with'the 1-'otor,-0t an A: C. motor for :d-riving. the sameaa- DAG. precession motor ror the-st-abilizer,- an A. G.-D. C. generator set for drivingisaid motors, .and means for altering the connection of said precessionimotorand said generator set to retard-the precession-'by causing said precession motor'to act-as a generator to assist in driving sa-i'd rotor'through said generator set.

32. In a gyroscopic stabilizer, the combination with the rotor, 01" a motor for drivingfithe same,-a precessionmotor for the stabilizer,-a'po-wer driven generator set'for drivingfisaid motors, and means for altering through said generator set.

33. Ina gyroscopic stabilizer, the combination with .the.rotor.. of a motor for drivingflthc. same, a precession motor for the stabilizer, a power driven generator set for supplying power to both motors, said set having a. plurality. of field windings. of shunt and series characteristics, and .means for causingsaid precession motor to act as a generator to aid in-drivingsaid .set by employing, only said generator field. winding otseries characteristics.

3a.. The combination with a gyroscopic stabilizer, of a-precession motor therefor, an electrical vsupply system. for said motor, and means for causing said motor to operate regeneratively to control the speed of preaxis enrolling of the ship about a second cession. axis and regenerative means for decelerating 35. The combination with a floating body, the gyroscope about its precessional axis, 10

of means for absorbing the rocking energy whereby power is generated from the Waves.

imparted thereto by the Waves and convert- In testimony whereof I have aflixed my ing it into power comprising a gyroscope signature.

mounted thereon for precession about an HERBERT H. THOMPSON.

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