US1136739A - Phonograph. - Google Patents

Description

G. S. TIFFANY.

PHONOGRAPH. APPLICATION FIL'ED AUG. 7. 1914.

Patented Apr. 20, 1915'.

2 SHEETS-SHEET 1.

lgii nesses 26 Invent/074 G. S. TIFFANY.

PHONOGRAPH. APPLICATION FILED AUG-H1914.

Patented Apr. 20, 1915.

2 SHEETS-SHEET z.

Indenfor ZUL' 572955125" GEOBGE S. TIFFANY, O1 SUMMIT, NEW JERSEY PHONOGRAPH.

Specification of Letters Patent.

Patented Apr. 20, 1915.

Application filed August 7, 1914. Serial No. 855,574; i I

To all whom it may concern:

Be it known-that I, GEORGE S. TIFFANY, a

citizen of the United States, residing at 'Summit, in the county of Union and State of New Jersey, have invented certain new and useful Improvements in. Phonographs, fully described and represented in the following specification and the accompanying drawings, forming a part of the same.

results with a motor mechanism which is This invention relates to electrically driven phonographs, and more especially to the motor apparatus of phonographs of that. type in which the record body is in the form of a fiat plate'or disk.

The object of the invention is to provide an electrically driven phonograph by which the record body shall be moved with the greatest possible constancy of speed and smoothness of operation and without vibration or noise, thereby securing the best results both in the character of records made and in the clearness and quality of reproduction- The invention aims further to secure these extremely simple in construction and eflircient in operation, and which shall operate with very small consumption of current.

To these ends and to attain other objects which Wlll hereinafter appear, the invention consists in the features of construction, ar-

. rangement and combination of parts which will appear from the description following, and which are particularly pointed out in the claims. I

In the accompanying drawings :--Figure l'is a bottom'plan view of an approved em-. .bodiment of the invention as applied to a phonograph of the disk record type, the circuit connections being indicated diagrammatically: Fig. 2 is a side elevation of the apparatus shownin Fig. 1, most of the circuit connections being omitted; Fig. 3 is' a side elevation, on a larger scale than Figs. 1 and 2, of a partof the motor" apparatus showing the governor by which the speed of the record support is controlled. Fig. 4 is a detail view on the scale of Fig. 3 of the combined starting and stopping brake and switch. --Fig. 5 is a'diagrammatic view illustrating another arrangement of' the circuit connections and a modified construction of the governor. 'Figr6-is' a detail view-showing-one of the armaturebodi'es of the most desirable form.

Referring first to Figs. 1 to 4, the operat- 'ing parts of the apparatus as shown are carried by a T-shape'd supporting frame liavlng a main stemlO anda cross bar 11. The stem 10 has upwardly and downwardly extending bosses 12 formed with a'through' opening to receive the shaft 13 of the plate or disk 14 which forms the table or support for carrying the record disk, and which; for a reason which will appear hereinafter is best made of a suitable nonmagnetic .matecial such for example as type metal. The

usual ball hearing or other suitable antifriction hearing may be provided between the table 14 andthe upper face of the boss 12. Carried bv the table 14 are a number of armature bodies 15 arranged equidistant from each other and at equal distances from the axis of rotation of the table. These armature bodies 1 most desirably project:

downwardfrom the under side of the table and may be forme'deach of a single block of iron or other magnetic material, but mo t desirably the bodies are each made up'o a the cross piece 11 of the carrying frame.

The circuit to the magnet 20 is controlled according to the rotation of the table 14 so that unless the magnet circuit is otherwise broken the magnet will be energized as each of the armature bodies approaches its polar extensions and will be denergized as each armature body reaches or approaches a cen- .jtral position with respect to'the polepiec'es;

For so controlling the magnet circuit in the construction shown, a circuit making and 10 0' breaking device is provided, the operating element of which is a toothed wheel 25 sef oted lever or dog 27 is mounted within the housing and is spring pressed by spring 28' away from the plate 29 as successive teeth of the wheel engage the projection of the lever and force it outward. The lever 27, housing 26 and T-shaped supporting frame, including the boss 12, may all be of metal and inthe construction shown are included in the motor circuit. 7

The speed ofrotation of the record carrying-table is controlled by a circuit-controlling; governor which is driven from an annular rib or flange 30 extending downward from the under face of the table concentric with the axis of rotation and most desirably within" the circular row of armature bodies. This flange drives a governor shaft 31 through ..a friction wheel 32 carried by the shaft. The governor shaft is mounted in a beari ng s1eeve'33 which is carried by an angle' piece or bracket 34 secured to the stem 10 of, the supporting T frame, the bearing sleeve extending above and below the horizontal arm of the bracket and passing in, the construction shown through the stem 10.

The bracket is mounted, as by means of screws passing through slightly elongated openings therein, so as to be capable of movement to carry the friction wheel 32 toward and from the annular flange 30 to pro vide for adjustment to secure suitable pressure of the friction wheel against the driving Most, desirably automatic adjustment is secured by means'such as a spring 35 tending to move the bracket to hold the friction wheel yieldingly against the face of the driving flange. The shaft 31 carries at its lower end a cross bar 36' secured to turn with the shaft and, which carries a flat spr1ng,,37 extending parallel to and a short distance below the lower face of the bar and secured to the bar at its ends, the ends of the spring inthe construction shown being bent upward and secured to upwardly bent ends of the bar. with the ends of the bar, the spring is out of contact with and spaced slightly away from the bar so as to be capable of being flexed to cause its central portion to move toward and'from the bar. The spring carries .a pair'of centrifugal weights 38 by means of stems 39 rigidly secured to the spring and which in the arrangement shown 1n Figs. 2- and 3 extend upward from the spring one on either side of the axis of ro- Except for the connectiontation, the stems passing through clearance openings in the bar. When the shaft 31 is rotated, as the speed of rotation increases, the centrifugal weights tend more and more to move outward and to flex the spring 37 7 and bends its middle portion upward toward the bar 36. The spring is in electrical connection with the supporting frame stem 10 and carries at its central or axial point a contact terminal 40 which normally rests '75 against a coiiperating stationary contact piece 41. to 1 close the motor circuit at this point.

By the upward movement of the middle I portion of the spring underthe influence 0- of the centrifugal weights, the contact 40 is carried away from the stationary contact 41 and the motor circuit'is opened at this .point when the. governor exceeds a certain speed of rotation, and the speed of the gov ernor at which the motor circuit is thus broken depends on the position of the contact 41. To provide for varying the speed of rotation to which the table-will be held by the action of the governor, the stationary contact 41 is made adjustable, being in the construction shown carriedby'but insulated from a bar 42 which is attached by means of through an opening in the outer end of the bar and is formed with a shoulder to bear on the bar. The upper-end of the screw rod 105.

has a knurled head by which it may be turned. By turning the screw rod to move it downward the bar is adjusted to raise its contact 41 into firmerengagement with the governor spring contact 40 so that a higher lie speed of rotation of the governor, with corresponding increase in speed of the table 14, is required to cause an increase in the centrifugal force exerted suflicient to;bend the spring 37 enoug' lr I-to carry the contact 40 away from thet'centact 41; and, contrarily, by turning the screw rod in the opposite direction the inner end of the bar will be moved downward to lower the contact 41, and a lesserspeed of rotation will serve to 129 separate the contacts andthe speed of rotation of the table will thus be reduced.

Contacts 40 and 41 aremost desirably of dissimilar metals such as, silver and nickel. In order to diminish any sound resulting 2 from the vibration of the governor spring a 37, I find it desirable to apply acoatin'g of fabric, such as ordinary adhesive tape, to one or both faces of the free portion ofthe spring, a by folding a piece. of adhesive 130 tape about the spring on each' side of the contact 40 as indicated by the dotted line 3 in Fig. 3.

The. governor is extremely sensitive and reliable 1n operation. The contact terminals are self cleaning, and there is practically. no friction loss between the centrifugal force of, the weights and the resistance of the spring 37.- A very sensitive balance is,

therefore, maintained between thesetwo forces. So responsive is the device to very slight changes in speed that the contacts 40 and 41 are maintained in tremulously intermittent engagement while the motor is in normal operation, with the result that an effectively constant speed is maintained; and it may be-that even without complete separation of the contacts continuing. through Wholev rotations, the governor, by controlling the meeting pressure of the contacts and thereby varying and adjusting .the relative or. proportionate time of engagement of the actual contacting points ofthe meetin-gfaces of the contacts, maintains the desired constant speed of 'the table by adjusting the inean strength of the currentflowing to the magnet when the circuit is closed by the interrupting lever 27. The phonograph is started and stopped by means of a combined brake and switch which also acts to give a starting impulse to the table when moved to rele'ase the table and close the motor circuit. This device comprises a stop lever 50 which is pivotally mounted on but insulated from the stem '10 of the supporting frame at apoint inside of the peripheryof the neeted at one end to a pin 53 carried by the arm 50 and at the other end to a post 54 extable-and carries a pivoted-brake shoe 51 which may be brought into engagement with the edge of the table by movement of the lever in the direction of] rotation of the table. A bow spring 52 is pivotally con.-

tending upward from the supporting frame stem 10. The ends of the spring 52 tend to move apart, and the pin 53and post 54 are I in suchrelation to the pivotal point of the in the direction of movement'pf' after he brake shoe comes .smihere ith has the tendency totlg-hten the brake; A' contact piece 55-mounted on but stop lever that when the leveris in the position for operation of the phonograph with the brake shoe removed from the edge of the table-as shown in Figs. 1 and 4, the

tension-ofthespring will tend-to hold the arm in this position, and that when'the-arm v is moved to. apply the bra-kethe pin 53 will move across the line between thepivotal a'xi's of the arm and the post 54 so that the spring will then act on the arm in t'hedirection to, carry andhold the brake shoe against the .edge of the-table. 1 As the brake shoe moves into engagement with-the edge of the table ejtable edge," any continued tur nipg of 'thjeiietable nto engagement insulated from the supporting frame stem 10 serves as a stop for the lever 50 when in the position shown in'Figs. 1, and 2 after it has'.been moved'to release the-table, and in this position,-in the construction shown,

the pin 53 engages this contact. 55. The post '54isfiinsu'lated from the'supporting frame stem 10 in order that'the pin 53 and parts -in' connection therewith shall be insulated from the supporting frame. The contact.

piece 55 is electrically connected as by wire a with the governorv c'ontact piece 41 as shown'in Fig. 1, and connection from thepin '53 which serves as a contact member cooperatmgwith the contact piece. 55 is made by wire 6,- which, as shown may be con- 1 nected to the spring .52.' The motor. circuit will therefore be opened by separation of" the pin 53 and contact piece 55 when the stop lever is moved to ap lythe'brake, and will be closed at this point when the 'stop "lever stands in position for operation of the phonograph as shown in the drawings.

When the stop lever is moved to release the" table, the movement of the brake shoe as.

it leaves the edge of the table gives a slight startingimpulse to the itable. This slight impulse or movement, which with'the'con struction shown is a backward/movement,

.serves to insure. the starting of the table when thebrake is released and the motor circuit closed, insuring operation of the motor apparatus shown by moving the table circuit would be broken between the contact piece 29 and the lever 27.

The supporting frame may be mounted in out of any dead position in which the motor any suitable manner, but it. is especially designed so that the stem 10 and cross bar llmay be screwed or otherwise secured.

' directly to the under side of the usual board or plate of the phonograph cabinet directly above -which the record carrying table stands. .Such'plate is shown and marked 60 in Fig. 2 and is formed with a circular'opening of a size suflicient to receive the circular 3 row of armature bodies and havingezitem,

s ons at opposite sides to accommodate the motor magnet and-the parts of the start ng anddstopping device respectively as md'icate by dotted linear in Fig. 1.

In the operation'ofthe machine, assuming.

that the stop lever 50 is in position for "operation of the phonograph as shown in tation, .in the position of the table shown in the drawings, and that the table 14 is in -ro-- Fig. 1 an armature body '15 has completely entered the space between the magnet poles and the dog 27 has been moved] by' the toothed wheel 25 out of engagement with the contact piece 29 to. open ,the motor circuit at this point. Rotation of the table then continuing, the toothed wheel 25 turns with the table and the engagingtooth of the dog ent ers.between teeth of the wheel and the end of the dog comesinto engagement =with the contact 29', closing the motor circuit at this point and establishing the circuitas follows :-From one pole of battery 65 by,

' t-ure body and draw it into the space between the magnetpoles, and the dog 27 will then be moved by the next tooth of the wheel 25 away from the contact 29, thus opening the circuit again at this point and deenergizi'ng the magnet as the armature body comes to central position between the magnet poles.

As this armature body by the continued r qtation of the tableis moved beyond the .magnet poles and the next armature body.

approaches the magnet, the dog27 again comes into engagement with the contact 29 to close the circuit and the magnet is again energized to cause it to attract the approaching armature body, and this action is repeated to give successive impulses to the table as the armature bodies successively ap-' Such successive improach the magnet. pulses, which follow closely one after the other because of the large number or close arrangement of the armature bodies,- gradually accelerate the speed of rotation of the i Y secured with the result that, variations in table. As the table rotates, it drives the governor through engagement of the =annular flange 30 with. the friction wheel 32, and asthe' speed of the governor increases with increase inspeed of the table the .cen trifugal weights 38 of the governor tend more and more to bend the governor spring 37' upward until finally when a certain speed is reached, dependent on the adjustment of the governor, thegovernor comes into action and by controlling the magnet circuit prevents further increase in speed and maintains' the desired constant speed 'of'the table. By reason or the extreme sensitiveness of the governor as hereinbefo're pointed out, a very close control of the driving power is I the speed of rotation of the't able are practically eliminated and an effectively constant speed of rotation maintained. I find that when operating with direct current there is some advantage in connecting a non-inductive resistance across the governor contacts, as indicated by dotted lines at o in Fig. 3, to prevent complete cutting off of currentfrom the magnet by operation of the governor. I

The rotation of the table may be stopped when desired by moving the stop lever 50 to throw the brake shoe ntoengagement with the edge of the table and at the same time to open the motorcircuit by'movlng the pm 53 away from the contact piece 55; and to start the rotation of the table it ,is only necessary to move the stop lever back to the position shown in'the drawings, thereby releasing the table, closing the circuit'between the pin 53 and the Contact piece 55, and imparting a starting impulse to the table. By

turning the screw rod/14 to adjust the bar 42 the speed of rotation which will be maintained by the goyernor may be varied and adjusted as desired.

It is of utmost importance for best results,

not only that the record body shall be moved at a constant uniform speed, but also that the operation of the phonograph shall 'be without vibration of the record body and also without any kind of ,vibration of the parts of the apparatus which would result in noise. An important feature of my construction contributing largely to the elimination of all vibration and suppression of noise is that the armature bodies carried by the table are, as they come within the influence of the magnet, balanced magnetically in the magnetic field. This result is secured a in the apparatus shown by causing the armaturebodies to pass successively between two pole piecesof the magnet, the parts being arranged so that the outward'and inward pull on each armature body as it approaches the'magnet shall'balance each otherto cause the resultant pull of .the combined forces acting on the armature body to be substantially in the direction of movement of the body and of the portion of the table by which it is carried, and so that the pull of the magnet shall not cause any flexing or bending of any part of the apparatus. In order to secure to the greatest extent such balancing of the armature bodies in the magnetic field, the bodies are made wider at their outer ends in the direction of move.- ment than at their inner ends, or with their sides substantiallyradial with respect tothe axis of rotation, and the magnet is mounted so as to be adjustable radially with respect to the armature bodies. Such adjustment of the magnet is provided for in the apparatus shown by adjustably securing the magnet carrying plate 21 to the supporting frame a as indicated in Fig. 2. This adjustment of v the supportipg plate 21 may also provide for a slight swinging or angular adjustment of the magnet in the plane of m'ovement of the armature bodies'to move its outerpolepiece forward or backward with respect to its inner polepiece. In order to prolong somewhat the pull on the armature body as it. first enters between the polepieces of the magnet, the inner faces of the polepieces are most desirably formed as shown to slant outward slightly toward the side at which insane I Q thearmature bodies enter. It is also desirable that the armature bodies shall be short solid bodies rigidly secured to the table, that the magnet polepieces shall extend reasonably close, to the under face of the table so that the pull on the armature body shall be exerted in-a plane close to the table, and that the table itself shall be of reasonably heavy and rigid construction to rigidly support the armature bodies and resist the slight bending strain resulting from the pull of the magnet on the arniatures in theapparatus shown, and furthermore that 'the' table shall be of non magnetic material so as to magnet, including means whereby the ener-. giz'ing flow of current or a principal part thereof is'prevented from following the path through this shunt circuit serves such purpose. 7 by the wire 8 in-Fig; 1,-and in order to pre- Sucha shunt circuit is indicated vent the passage of the energizing flow of I current through such shunt circuit and to provide a free efi'ective path for the magnet discharge current, I connect in such circuit, when economy in current consumption is of prinfe importance as when the current is supplied from primary batteries and especially from dry cells an electrolytic valve V which may consist of an aluminum plate and a lead plate immersed in a solution ofammonium phosphate, Such electrolytic valve sults secured 'by the use of an electrolytic.

or condenser acts in the shunt circuit as a flow-controlling valve, resisting'flow of current in one direction-but permitting with very little resistance an effective flow of'cur- 1 rent .in theother direction. By suitably connecting the shunt circuit around the magnet,

and including in it such a flow-controlling valve, the flow of current throughthe shunt from the energizing circuit is practically or effectively prevented, while the effective flow of the magnet discharge current in the 0pposite direction through the shunt meets with little, if any resistance. Other forms of condensers which will efi'ectively prevent the flow of the energizing current of com- ;paratively low 'ilectro motive force, but which will not 0 struct the effectlve flow of the magnet discharge current which is of comparatively higlfelectro motlve force, might be employed tdapprommate the revalve, and where economy in current consumption is not of importance, the elim nation of sparking and suppression of noise and jar from the magnet discharge may be obtained by substitution of a non-inductive resistance in a closed shunt circuit.

Fig. 5 illustrates an arrangement of cir- .cuits with which the motor magnet is deenergized when the circuit interrupting dog or lever 27 is in engagement with the contact 29 or when the governor contact 40 is in engagement with the contact 41. As represented in this figure, the source of supply of current is connected directly with the magnet coils by wires 9 and h, except that the supply circuit thus formed includes a non-inductive resistance to adjust the voltage on the magnet and the starting and stopping'switch or other main controlling switch which is indicated at S. The circuit interrupting lever 27 and the contact piece 29 are connected in shunt with the magnet by wires 5 and is, with the result that when the lever 27 is moved away from the contact 29 and the shunt circuit thus opened, the magnet will be energized, but when the shunt circuit is closed by the lever 27 coming into engagement with the contact 29 most, of the supply current will flow through the wires i-and k of theshunt circuit rather than through the magnet since the resistance of the shunt circuit is very much less thanthe resistance of the magnet coils, and the magnet will therefore have little or no force and may be considered-to. be deene'rgized' when the shunt circuit is closed. The shunt the magnet when it -is closed, will also at the same time furnisha path of low resistance for the magnet discharge current,

The governor as shown in Fig. -5 is also connected in shunt across the wires and 72, by -wires Z and m connectingrespectively lel with the circuit interrupter formed by the lever 27 and contact piece 29 and it acts.

to prevent the flow of energizing current to the magnet in the same way as the circuit interrupter, that is, by closing a shunt cir .cuit across the magnet coils which being of less resistance than the magnet coils affords a path for the flow of most of the current.

In order that the governor shall operate to' close circuit between its contacts when the speed of operation is excessive, the stems 39 ,which carry the centrifugal weights 38 extend from theh outer face of the governor spring 37 so that by the outward pull of the Weights the middle portion of the spring is bent-outward, or downward, to engage the contact 41 which normally stands out .off

' cirbuit, while deflecting the current from '105 with the wires 6 and 7c, and is thus in paral engagement with the contact 40 carried by thespring. vOtherwise, the governor is or maybe the same in constructlon as shown 1n the other figures and ashereinbe'fore de-:

scribed.

His to be understood that the invention is not to be limited to the exact construction of the apparatus and arrangement of circuits as shown in the drawings and to which the foregoing description has been largely confined, but that it includes changes and modifications thereof within the claims.

\Vhat is claimed is:

1. A phonograph comprising in combination a movable support for the sound record body, a plurality of armature bodies carried.

by said support, el'ectro-magnetic means for attracting said armature bodies, the arrangement of said armature bodies and said electromagnetic means being such that each armature body when attracted by the electro-magnetic means is balanced magnetically in the magnetic field, and means controlling said electro-magnetic means to cause it to attract said armature bodies in succession. a

2. A phonograph comprising in combination a rotatable support for the sound record body, a plurality of armature bodies carried by said support andspaced equaldistances apart, an electro-magnet for attracting said armature bodies having polepieces so arranged with respect to the path of movement of the armature bodies that each armature body in approaching the' armature body shall come within thers phere' of influence of both polepieces simultaneously, passing on one side of onepoleple'ce and onthe other side of the otherpoleplece,

and circuit controlling means, controlled-ac cording to the movement of the rotatable support for causing said ele'ctro-magnetic means to attract the armature bodies in succession.

4. A phonograph comprising in'combination a rotatable table for carrying a sound record diskbn the upper face thereof, a plurality of armature bodies carried by the table and projecting from the lower face thereof. said bodies being equidistant from each other and at equal distances from. the

axis of rotation ofthe table, electro-magnetic means for attracting the armature bodies comprising a pair of polepieces mounted so that as the armature bodies pass the lectro-magnetic means in succession each armature bodyf shall pass between and be attracted by both the polepieces, and

circuit controlling means for causing the .electro-magnetic means to attractthe armatune bodies in succession. I.

5. A phonograph comprising in combination arotatable table for carrying a sound record disk on its upper face, said table being formed of non-magnetic material, a plurality of armature bodies carried by the table and projecting from the under face thereof, electro-magnetic means for attracting the armature bodies comprising a pair of polepieces beneath the table imposition such that as the armature bodies pass the 'electro-magnetic means in success1on each armature body will pass between" and be attracted by both the polepieces, and circuit controlling means for causing said electro-magnetic means to attract the armature bodies in succession. i I

6. A phonograph comprising in combination a rotatable support for the sound record body, a plurality of armature bodies I carried by the support, electro-magnetlc means for attractingsaid armature bodies comprising a palr of pole pieces ,mount- .ed both on the same side of the, axis of rotation of the support and so. that them, and circuit controlling means for caus ngsaid electro-magnetic means to attra'ctthe armature bodies in succession.

r 7. A phonograph comprising in combination arotatable support for carrying thesound record body, a plurality of armature bodies carriedby the support, electromagnetic means for attracting said armature vbodies comprising a pair of polepieces between whlch the armature bodies successively pass, means for causing a relative adJListment between the support and said polepieces'tocausethe armature bodies in approaching the. polepieces each to be balanced magnetically in the magnetic field, and circuit controlling means for causing theelectro-Inagnetic means to attract the ar-' mature bodies in succession.

8. A phonograph comprising in combination a rotatable table for carrying a sound record, disk, a pluralityof armaturebodies carried by the table' aIIdp'rojectingYdoWntl1e' armature bodies shall pass between ward from the lower face-thereof, an electro-m'a gnet for attracting" said armature bodies having a pair of'polepieces between which the armature :bodies successively pass, I each armature body being simultaneously attracted by both polepieces, ,said magnet being mounted to beadjustable in position radially withvrespect to. the path of movement of the armature bodies, and circuit controlling means for causing the magnet to attract the armature bodies in succession.

9. A, phonograph comprising in combi nation a rotatable table for carryinga sound,

record disk, a plurality of armature bodies means-intermittently as the support ,rotates,

carried by the table and'projecting downward from the lower face thereof, an electro-magnet for attracting said armature bodies havin a pair of polepieces on the same side 0 the table axis and between which the armature bodies successively pass, said magnet being adjustable in position radially and angularly with respect to the path of movement of the'armature bodies, and circuit controlling means for causing the magnet to attract the armature bodies in succession.

10. A phonograph comprising in combination a rotatable support for the sound record body, a plurality of armature bodies mounted to revolve with the support, an

electro-magnet for attracting said armature.

pass, and a shunt circuit around the magnet aflording'apath for the magnet discharge current and including means for effectively preventing fiow of the magnet energizing current through said shunt circuit.

12. A phonograph comprising in combination a rotatable support for the sound record body, a, plurality of armature bodies mounted to revolve with the support, an electromagnet for attracting said armature bodies,- circuit controlling means for causing the magnet to attract the armature bodies in succession, a governor controlling the magnet supply circuit, a shunt circuit' aroundthe magnet, and a flow controlling valve in sald shunt circuit to effectively prevent flow of the energizin current thercthrough and to permit flow o the magnet discharge current.

13. A phonograph comprising in combination a rotatable su'pfport for the sound record I body, a plurality o armature bodies mounted to move with the support, an electro-mag; net for attracting said armature bodies, circuit controlling means for causing the magnet to attract the armature bodies in succession, a shunt circuit around the magnet, and an electrolytic valve connected in said shunt circuit. v

14. The combination of a rotatable sound record body support of a phonograph, electro-ma'gnetic motor means for drivingsaid support, a device controlled by the angular position. of said support for energizing said ,means adapted When-moved in one direction to efi'ect a break in the motor circuit and simultaneouslystop rotation of the support, said means being adapted when moved in another direction to close said break in the motor circuit and simultaneously to impart a starting impulse to the support to insure the energizing of the motor circuit by said vdevice. I

15. The combination of a rotatable sound record body support of a phonograph, el'ectro-magnetic motor means for drivlng said support, a device controlled by the angular position of said support for energizing said means intermittently as the support rotates, and means adapted when moved in one direction to effect abreak in-the motor circuit and when moved in the other direction to close said break and mechanically start the rotation of the support to insure the energizing of the'motor circuit-by said device.

16. A phonograph comprising in combination a rotatable support for a sound record body, a plurality of armature bodies mounted to revolve with said support and spaced equal distances apart, an electro-magnet for attracting said armature bodies having apairof polepieces mounted so that each armature body shall pass between said polepieces and be attracted'by both said polepieces simultaneously, and circuit controlling means for causing the magnet to attract the armature-bodies in succession, the inner faces of the magnet polepieces being formed to slant outwardly toward the side at which the armature bodies enter between them.

17. A phonograph comprising in combina-- tion a rotatable sup ort for the sound record body, a plurality o armature bodies mounted to revolve with the support, electro-mag netic means for attracting said armature bodies comprising a pair of polepieces mounted radially of the axis about which the armature bodies revolve and so that each armature body shall pass between said polepieces and be attracted by both said polepieces simultaneously, said armature bodies being wider in the direction of their movement at their outer ends than at their inner ends.

18. A phonograph comprising in combination a movablesupport for the sound record body, a plurality of armature bodies mounted to move with said support, electro-magnetic means for attracting said armature.

19. A phonograph comprising incombination a rotatable support for the sound record body, a plurality of armature bodies mounted to revolve with the support and spaced equal distances apart, electro-magn'etic means for attracting said armature bodies comprising a pair or polepieces mounted on the same side of the axis of revolution of the armature bodies so'thateach body shall pass between said polepieces and 10 be attracted by both said polepieces simulta-neously, and circuit controlling means for causing said electro-magnetic means to attract the armature-bodiesin succession.

In'testimony whereof I have hereunto set my hand in the presence of two subscribing witnesses. GEORGE S. TIFFANY.

Witnesses:

A. L. KEETS,

PAUL FRANKE.

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