US1323710A - malthaneb - Google Patents

Description

J. F. MALIHANER.

COMBINED TELEPHONE mo PNONOGRAPH.

APPLICATION FILED DEC-11' l9l4.

Patented. Dec. 2,1919. 3 SHEETS-SHEET I J. F. MALTHANER. COMBINED TELEPHONE AND PH'ONOGRAPH.

APPLICATION FILED own, 1914.

Patented Dec. 2, 1919.

3 SHEETS-SHEET 2.

g I I 120' 7/ .4trv

J. F. MALTHANER.

comamzo TELEPHONE AND PHONOGRAPH. Y

APPLICATIONgFPLED DEC. 12, I914- 1919. 3 SHEETS-SHEET a.

Patented Dec. 2

union.

JOHN F. MALTHANER, F ATLANTA, GEORGIA.

COMBINED TELEPHONE AND PHONOGRAPH.

Specification of Letters Patent.

Patented Dec. 2, 1919.

Application filed December 12, 1914. Serial No. 876,864.

To all whom it may concern: 7 Be it known that I, JOHN F. MALTHANER,

a citizen of the United States of America,

. ments'in Gombined Telephones and Phonographs, of which the following is a specification.

My invention relates to a combined telephone and phonograph and has for its principal object to provide a means whereby telephone conversations may be recorded upon a record cylindero'f a commercial dictating machine, a further object of the invention being to so arrange the electrical circuits that under ordinary dictating conditions, certain parts of the apparatus used for receiving and .transmittmg telephone messages maybe used by the dictator. I

In setting forth my invention, I only deem it neccessary to show the essential features of the dictatingmachine equipped with my improvement. The mechanism' illustrated includes a standardco'mmon battery desk telephone equipment connected in circuit with an electro-magnet located on a standard Edison dictating machine, the dictating machine being slightly modified to be operated by the electro-magnet. 1

In order to avoid any objections of telephone companies due to the fact that the dictating machine is connected to the telephone circuit, one of the principal objects of this invention is to provide means for obtaining a record of the telephone conversations without actually mechanically or electrically connecting the electric devices of the recording mechanism with the commercial companys lines.

Another object is to modify the construction of the magnetic recorder so that it will respond quickly to the slight variations on the surface of the phonographic record and to prevent accumulations from, interfering with the proper operation of the diaphragm.

The above and other objects and the novel features of my invention will be apparent from the following description, taken in "connection with the Figure 1 is a diagrammatic representation" of so much of a recording mechanism as is necessary to show my invention applied thereto, and illustratm the clrcu ts and manner of deriving t e, commumcatlon accompanying .drawfrom the commercial telephone companys lines;

Fig. 2 is a plan view and Fig. 3 is a cen-.

tral longitudinal sectional view of the/6o special telephone instrument capable of recelving a message from the telephone companys lines and also capable of use as the mouth piece for direct dictation,

Fig. 4 is an underside perspective view of a cover used in the instrument shown in Figs. 2 and 3;

Fig. 5 is a central longitudinal sectional view of a magnetic recorder;

Fig. 6 is a bottom plan view of the magnetic recorder;

Fig. 7 is a transverse sectional view taken along the line 77 of Fig. 5, looking in the direction of the arrows;

Fig. 8 is a bottom plan view of the counter-weight and associated spring; and

Fig. 9 is a perspective view of a felt Washer located between the reed armature and the electro-magnet. 1

Referring to the drawings, and-more particularly to Fig. 1, I have illustrated only a suitable mandrel which rotates with the shaft 11. The shaft 11 is slidable lengthwise of the mandrel and has a clutch disk 12 fixed thereon provided with teeth that are capable of engaging corresponding teeth on the hub 13 of a drive wheel 14, connected by a belt 15 with a motor 16 which is mounted in any suitable position, as on the underside of a table 17. p

The shaft 11 is moved lengthwise into and out-of clutch with the motor driven wheel 14: by means of a lever 18 pivoted at 19 on the table- 17 and connected to the shaft 11 by. a yoke 20, The lever 18 is rocked on the pivot 19 by an arm 21 which is connected to the lever 18 by a rod 22. The arm 21 is fixed on a short shaft 23 which is oscillated by a rockable, member 24 also fixed on the 'The buttons 27- and 28 are respectively the stop and start buttons of the machineandtheir shanks extend through the table 17, enga Tng the arms 25 and 26 respectively and by t e connections between the member worksin the cylinder 32 and has connected thereto a rod 34,. the opposite end of which is pivotally connected to the member 24 bethe arms 25 and 26. It will be evidentthat when the bulb 29 is pressed, air

' entering the cylinder 32 will force the plunger 33 outwardly and move the arm 24 to the right as shown in Fig. 1, and throw in the clutch, which will start the rotation 'of the record receiving cylinder. 'A similar movement of the arm 24 ma be accomplished by depressin the start utton 28. A release.

of the bul I 29 permits the air to escape from the cylinder. 32 and the plunger 33 will return to its initial position, which movement will throw the arm 24 t0 theleft and throw out the clutch, stopping. the rotation of the record receivingcyli'nder. A similar movement'tojthele'ft' 'of the arm 24- may be manually eifected' by depressing the stop. but- L An auxiliary cylinder 35'is mounted on the underside-of the main air cylinder '32 and may be applied to the cylinder 32 by merely boringandithreadin a hole-in the underside of the pump cylinder 32 and conmeeting the two cylinders by a nipple 36. A lunger 37' works in the cylinder 35 and at 1tsouter end carries an arm 38 having. a halfdjrubber'head 39 which-is adapted to engage an inclinedportion'40'at the end ofa contactlspring. 41'. ltwill'be evident that as the 1plun'ger38 and head 40 are moved-outs War cy1ii1der'35' from the cylinder 32, the outer end of the spring 41 will: move downwardl'y into aridinake contact with the end Y of the s,pring,=42 -Bothsprings-41 and- 42 are secured atj'on'e end to an-j,.insulating lilbclij 43, which is, mounted" onthe under: side'of the glinder35. The foregoing auab.

iliary cylin er' 35 and the appliances com.

.n'e'ctedtherewithare soconstructed thatthey be applied tothe q ylinde'r32 asamniii' an are desembedm detail in the pending.

ap' iicati'on heretofore. referredfto."

I a he usual frame'forth'e recording and reproducing'instruments-of the standard Edi son dictating phonograph is utilized'and comprlses'a spectacleframe '44- whichis iv- 5 1 mounted on the" upper horizontal ar 45: The frame 44 ls also pivotedso a8 swing substantially horizontally or in its ow'rj lplitne' to bring, either the recorder or I apposition where" thesty'lus bythe' air which -is. forced into the- Referring to Figs. 5 to 9 inclusive, the

magnetic recorder embodying our invention comprises a stationary hollow casing or head 46 which has a flange 47 capable of supporting it withinone of the openings of thespectacle frame 44. The upper end .of the casing 46 is closed by a screw cap 48 and the lower edge has a lug or ear 49,'depending therefrom. The outer end of the lug or car 49 is perforated to receive a pin 50, whereby the magnet carrying frame is pivoted on the cylindrical casing 46.

The magnet carrying frame consists of a bar of suitable magnetic material-such as iron, bent intermediate its ends at four points as shown in Fig. 5, so as to provide 55 located on opposite sides of the frame.

Beyond the outer end of the seat 55, the bar is bent downwardly and bifurcated as at 56 and 57 to fit on opposite sides of the lug 49, and the bifurcated parts 56 and 57 have holes to receive the ends of the pin whereby the magnet and diaphragm carrying frame are pivotally supported from the casing. p p

The diaphragm 58 comprises a thin elastic metal plate or reed ofmagnetic material which has its ends perforated to receive the screws 59.- and 60, whereb it is fastenedto the seats 54 and on. t e magnet frame. Intermediate its ends, the diaphragm 58'is gradually contracted from its ends toward the center, and substantiallyat the center there is a lug 61 which carries the cutting sapphire or stylus 62 which is capable of engaging 'and (producing a record on the rotatable reco'r receiving medium 10.

, eIe'ctro-magnet 63 having a soft iron core .64, extending beyond each end thereof, is adjustably secured to the inner side of the top. part53 of the magnet: frame by a screw 65; One end of the core 64- rests a the inner side-of thewall 53 and the .ot er end is disposed in close proximity to the side e. diaphragm 58v and on-theo posits sidef'thereof from the stylus 62. the

construction. of the frame and theconnection of the. reed armature or diaphragm 58 and core. 64:. to said-frame, .I: obtain a -closed magnetic circuit withbut a single air gap,

that between the armature 58 and;the' lower part of the core of. the magnet.

When the winding of the electro-niagnet. 63 is deenergized. the value of the ma etic flux inthe' corethereof. is substantial lw m na the 7 source of direct current an initial quantity i ,through the wall of the casing to providethe binding posts 85 and 86 on the innerof magnetic flux is established therein.

I 'In'order to'exclude cylinder shavings and other foreign particles from becoming lodged between the surface-of the magnet, core 64 and the inner slde' of the reed 58,

and also toeliminate'the metallic sound of the reed armature due to overtones and harcapable of fitting the end of the core 64 and monies we insert a felt washer66 in the space between the magnet and the dia p'hra The felt Washer has a hole 67 is of sufiicient thic'kne'ssto extend slightly beyond the end of the core. The feltwashe r surrounding the core serves as a damper and while we have adopted felt, it is to be understood that other suitable material may be'found which will serve equally well.

In order to compensate for slight variations on the surface of'the phonographic record and to provide for all variations and difference in the thickness of records, as, for instance, the difference in thickness of new and reshaved records, I provide a novel means for suspending the free end of the magnet and diaphragm carrying frame on the opposite side thereof from its pivotal support. The outer side of the inclined member 51 of the magnet carrying frame has a hook 68 fixed thereon which, by means of a wire link 69, is flexibly connected to a 'hook 70 at the outer end of a flat spring plate 71 rigidly connected by the screws'72 to the underside of a counter-weight 73.

The counter-weight 73 'is a semi-circular plate of material conforming'to the shape of the cylindrical casing 46 but of smaller diameter. At its opposite ends, the counterweight has recesses to receive the pointed ends of threaded pins 74 and 75, whereby the counter-weight is pivoted on the interior of the casing 46 substantially directly above the magnet 63. The pins 74 and 7 5 pass through threaded holes on diametrically opposite sides of,the casing 46 and are provided with the slots 76, whereby they may be adjusted with a screw driver or similar instrument, and by means of the nuts 77 they may be locked in adjusted position. v

The upper side of the counter-weight 73 has a lug 78 with a threaded opening to receive the threaded shank 79 of an adjusting screw 80, by means of which the effect of the counter-weight may be varied. The

nut 81 may serve to lock the adjusting screw 7 in its adjusted position or it may also be sol used to vary the adjustment of the counter weight, the counter-weight 73 being cut away intermediate its ends as at 8:2 to receive the adjusting nut 81. It will be seen that by varying the position of the adjusting screw 80, the effect of the counter-balancing weight 7 3 may be changed and a very fine adjustment may be obtained. T he casing 46 has two binding postsSS and 84 fixed to the wall thereof and the shanks of said posts extend side of the casing to which the winding of;

thebinding post 83. and the wire 89 connects the binding post 84 with one terminal of:

the transmitter 90 supported on the desk stand 91.

The desk stand 91 also carries a hook 92 which operates a spring switch 93 located .between the contacts 9a and 95. The switch 93 is-conncted by the wire 96 to a battery 97, which latter-is connected by a wire 98 to the other switch spring 42 on the underside of the pump cylinder 35. Thewire 99 con- .nects the other side of the transmitter 90. to the switchcontact and the wire 100 with thewire 99 connects the switch contact 95 and 101, the other side of the receiver being connected by the wire 102 to a battery 103 which latter is connected by a wire 104 to the other switch-contact 94 controlled by the hook 92. hen the receiver 101 is on the hook 92 and the recording mechanism has been started by operating the plungers 33 and 37, the transmitter 90 may be used as the ordinary mouth piece of a dictating machine for dictation purposes. The electromagnet 63 will be energized with current by the batter 97-and sound vibrations in the transmitter 90 will operate the diaphragm thereof to create changesin flux density in the magnet 63 which vibrates the diaphragm 58 and stylus 62. The apparatus thus far described is entirely separate from and independent-of the commercial telephone companys lines and instruments.

In order to obtain a record of a conversation sent overa telephone line, the special transmitter 90' has been devised which can be used as an ordinary transmitter or is adapted to receive the sound vibrations delivered or emitted by the receiver 105 of a standard desk telephone set. The standard desk telephone set also has the pedestal 106 .which supports the ,usual transmitter 107,

and both the transmitter ,107 and the receiver 105 are connected to the telephone line comprising the wires 108 and 109.

. The special transmitter 90 comprises a casing 110 constituting the diaphragm chamber and containing the usual diaphragm 111 and other working parts, which as herein shown are substantially those of a standard Kelloggtransmitter. The type of transmit- I ter working parts is however immaterial. The front of the casing 110 consists of an annular member 111' which is screwed to one end of the sound tube 112 and a mouth piece 114 is screwed into the other end of said.

' duct-113. At its outer end, the tubular member 115 has a seat 117 provided with'a rim flange 118. The seat 117 is circular and the flange 118 confines a felt pad 119 on said seat. The felt pad 119 is annular in shape so as to provide an opening therethrough in line with the inletopening 120 of the lateral passageway 116. As shown in dotted lines, the felt pad 119 serves to yieldingly support the receiver 105 in such a position that the sound waves emitted from the central.

opening 121 of the receiver will be delivered directly into and in line with the sound duct 116 and from there will be delivered into the passageway 113 and to the diaphragm 111 when the door 122, which controls communication between the passageway 116 and duct 113, is down.

The door or cover-122 is pivoted at a point 123 where the passageway 116 opens into the duct 113 and in such a position that when the door is down, as shown in dotted lines in Fig. 3, it will revent the entrance of sound from the mout piece 114 through the duct 113 to the diaphragm chamber but will permit sound entering from the passageway 116 to pass through the duct 113 into the diaphragm chamber, the door being disposed at an angle serves to deflect the sound. The means for raising and lowering the door comprises a button 124:, the shank of which is adjustably connected by a set screw 125 to a rod 126, at the lower end of which is a hook 127, a part of which extends into a recess 128 in the underside of the door 122.

As will be seen, the rod 126 extendsthrough a hole in the wall of the tube 112 and into the interior of the tube. ,The spring 129 bearing against the outer surface of the tube communication between the passageway'll6 and the duct 113. Itwill be seen that when the receiver 105 is set in position 'on the bracket formed by the support 117 and tube 115, the end of the button 124 will be engaged and depressed, thus releasing the door which by gravity will swing down into the position shown .in dotted lines, closing com m'unieation between the mouth piece114" and the 'dlaphragm chamber and opening communication between the passageway 116 and the; duct 113 to the diaphragm chamber.

' When the receiver 105 is removed, the but ton and door will be automatically restoreih' mally substantially nil and in magnetic cirto their mitial posltion. f The weight of the cuit with said vibratory member, a transreceiver will keep trols the door, depr the plunger, which con- When it is desired to record a telephone conversation, the receiver 101 of the isolated station is removed from its switch hook 92 and placed to the ear, the receiver 105 having been previously set on the felt padded bracket. The transmitter 107 of the in-' cluded in the circuit.

It will be seen from the drawings and the I foregoing description, that I h: ve provided a complete telephone station entirely isolated from the commercial telephone companys equipment. I utilize the special transmitter of the isolated stationto receive the con-' versation from the telephone line and also to deliver direct dictation to the phonographic mechanism. When utilizing the transmitter for direct dictation, the receiver 101 remains upon the switch hook 92.

WhileI have shown and described the in vention in detail, it will be apparent that tible of widerapplication, and therefore I do not wish to be limited to the exactdetails disclosed. 1 7

Having thus described the invention, what is claimed is 1. In an apparatus of the class described,

.95 the principles of the invention are suscepi the combination of an electric. cfi'cuit, areceiving instrument adapted to be connected therewith, said receiving instrument being" capableof producing sound, a recording mechanism having an electro-magnet in which the value of the magnetic flux is normally substantially m'Z, a transmitter, a source of direct current, means whereby direct current may be conveyed from said source to said transmitter and said electro- I @magnet and establish an initial quantity of magnetic flux inthe latter, and means whereby sound from said receiving lnstrrunent will create action in said transmltter and thereby cause variation in theiquan'tity of magnetic I flux in said electro-magnet.

'2. In a combined telephoneand phonograph, thecombination' of a telephone line, a telephone receiver in circulti therewith, a

phonographic mechanism comprising a rec-.-

0rd medium, a stylus capable of engaging said medium, a vibratory member capable of "vibrating said stylus,'an electro-magnet inwhichthe value of the magnet flux is nor- 1nittr, a' source of'direct current, means whereby direct current .may be conveyed no i from said source of said transmitter and bratory member being capable of responding to said flux variations whereby said stylus will cause a registration to be made upon said record medium.

111 an apparatus of the class described, the combination of an electrically operated receiving device capable of emitting sound vibrations when operated, a recording mechanism having a vibratory member, a stylus associated with said member, an electromagnet in which the value of the magnetic flux is normally substantially m'Z and in magnetic circuit with said vibratory member, means whereby said vibratory member is actuated by sound vibrations emitted by said device, said means including a trans mitter, a source of direct current, an electrical circuit switch, and a path for conveying direct current from said source through said switch, said transmitter and said electromagnet whereby an initial quantity of magnetic flux is created in said electro-magnet, and means for associating said receiving de vice with said transmitter whereby sound vibrations will cause variations in the quantity of magnetic flux in said electro-magnet.

4. In an apparatus of the class described, the combination of an electric circuit, a telephone receiver adapted for connection therewith, a phonographic recording device having an electro-magnet in which the value of I the magnetic flux is normally substantially m'l, electric means for operating said device including a transmitter, a source of direct current and a circuit capable of conveying direct current from said source to said transmitter and said electro-magnet whereby an initial quantity of magnetic flux is established in said electro-magnet, and means whereby the operation of said telephone receiver causes the operation of said electric means.

5. In an apparatus of the class described, the combination of a telephone line, a telephone receiver adapted to be connected therewith, a phonographic recording device having an electro-magnet in which the value of the magnetic flux is normally substantially nil, electric means for operating said device including a transmitter, a source of direct current and a circuit capable of 0on veyingdirect current from said source to said transmitter. and said electro-magnet whereby an initial quantity of magnetic flux is established in said electro magnet, and means-whereby sound vibrations delivered by said receiver are caused tooperate said electric means and thereby cause changes to take place in the quantity of magnetic flux m said elec-tro-magnet.

6. In apparatus of the class described, the

combination of a recording mechanism comprising a record medium, a stylus capable of engaging said medium, a diaphragm capable of actuating said stylus, an electro-magnet in which the value of the ma etic flux is normally substantially nil, said electromagnet capable of vibrating said diaphragm, a transmitter, a receiver, a circuit switch, a source of direct current, an elec tric circuit connecting said transmitter, said receiver, said electro-magnet, said source of direct current and said switch whereby an.

initial quantity of ma netic flux is created in said electro-magnet y said direct current when said switch is operated, a telephone line, a telephone device capable of producing sound, and means for associating said device with said transmitter whereby electrical changes on the telephone line will cause corresponding electrical changes to take place in the electrical circuit connected with said transmitter and said electro-magnet and cause variations in the quantity of magnetic flux, and whereby said diaphragm will vibrate in response to said variations.

7. In an apparatus of the class described, the combination of a recording mechanism comprising a record medium, a stylus capable of engaging said medium, a diaphragm capable of operating said stylus, an electromagnet in which the value of the magnetic flux is normally substantially m'l and in magnetic circuit with said diaphragm, a source of direct current supply, a transmitter, a switching device, an electrical circuit' including said electro-magnet, said source of direct current, said transmitter and said switching device, said device being capable of directing a fiow of direct current from said supply to said transmitter andsaid electro-magnet, said current creating an initial quantlty of magnetic flux in sai electro-magnet, a telephone exchange line, a telephone receiver in circuit with, said line, and means for associating said receiver with said transmitter whereby electrical changes on the telephone exchange line will cause corresponding changes to take place in the circuit. containing said eleotro-magnet.

8. In an apparatus of the class described, the combination of a recording mechanism including .a-diaphragm, an electric device for operating said diaphragm, an electric circuit connected to said electric device, a battery, and a telephone transmitter connected with said electric device by said circuit, a telephone receiver, a battery connected to said telephone receiver, means whereby said telephone transmitter may be connected in circuit with said electric de- :vice, said'means being capable of connect- ,ing said receiver with said transmitter and connecting the batteries in series.

9. In an apparatus of the class described, the combination of a telephone instrument comprising a diaphragm, a mouth piece, and a sound duct leading from said mouth piece to said diaphragm, a lateral passageway for sound waves opening into said duct between the mouth piece and the diaphragm, and means for controlling communication between said lateral passageway and said diaphragm from said mouthpiece.

11. In an apparatus of the class described, the combination of a telephone instrument comprising a diaphragm, a mouthpiece, and a sound duct leading from said mouth piece to said diaphragm, a lateral passageway for sound waves opening into said duct between th' mouth piece and the diaphragm,-

adevice normally closing the opening of said lateral passageway into said duct, and means whereby said deviceis adapted to prevent the admission to said diaphragm of sound waves entering through said mouth piece.

12. In an apparatus of thelass described, the combination of a telephone instrument comprising a diaphragm, a mouth piece, and

a sound duct leading from said mouthpiece to said diaphragm, a lateral passageway for sound waves opening into said duct, a

device pivoted within said duct and normally closing the inlet opening of said lateral passageway, and means whereby said device ispermitted to swing about said pivot into a passageway from said dia hragm.

13. In an apparatus oft e-class described,

the combination of a telephone instrumentcomprising a diaphragm, amouth piece, and

a sound duct leading. from said mouth piece to said diaphragm, a lateral'passageway for sound'waves opening into said duct, means for supporting a telephone receiver with its open end over the outer end of said lateral passageway, anda-device normally closing the inner end of said lateral passageway, said device'being adaptedto be actuated by a telephone receiver set in place over the-.lateral passageway.

1d. In an apparatus of the class described, the combination of a telephone instrument position to close said-duct at the opposite side of the inlet of said lateral toclose the'inlet of said duct from said opening and closing the inlet of sound from said mouth piece to said duct.

15. In an apparatus of the class described,

the-combination of a telephone instrumentcomprising a diaphragm, a mouth piece, and

a sound duct leading from said mouth piece to said diaphragm, a lateral passageway for sound waves opening into said duct, a padded support near the outer end of said lateral passageway, whereby a sound emittin device may rest on said instrument wit its outlet in position to deliver sound waves to said lateral passageway, and a cover for the entrance of said lateral passaigeway to said duct, said cover being pivoted so as to swing into position to close the duct on the opposite side of said entrance from said diaphragm to prevent the inlet of sound through said mouth piece, and a member engageable by said sound emitting device for controlling the dperation of said cover. 7

16. In an apparatus of the class described, the combination of a telephone transmitter 1 comprising a diaphragm, a diaphragm chamber, a mouth piece, a sound duct connecting the mouth piece'with the diaphragm chamber, and a lateral sound passageway opening into said duct, a bracket for sup porting a sound producing member in position to deliver sound waves to saidlateral passageway, a closure plvoted at the entrance. of the lateral. passageway 1nto said sound; duct and normall closing said entrance, a device engagea 1e by said sound producing member to release said pivoted closure and-permit it to swing into position and diaphragm at one sideof their pivotal support comprising a-counter-weight and aspring.

18. In an'apparatus of the'class described,

'the combination'of a stylus, a diaphragm,

a frame to which the diaphragm is attached, means for pivotally supporting said frame on one'side of said stylus, and means for supporting the frame at the opposite side of the stylus comprising a counter-weight. 19. In an apparatus of the class described, the combination of a stylus, a diaphragm, a frame to which the diaphragm is attached, means for pivotally supporting said frame on one side of said stylus, and means for supporting the frame at the opposite side of the stylus comprising a pivoted counterweight and a spring connected to the counter-weight and to said frame.

20. In an apparatus of the class described, the combination of a stylus, a diaphragm, a frame carrying said stylus and diaphragm, means for pivot-ally supporting said frame at one side of said stylus, an

means for yieldingly supporting said frame at the side opposite from the pivotal support, said means comprising a counterweight pivoted above the frame, a flat spring plate secured to said counter-weight and. connected to said frame, and means for adjusting the counter-balancing eflect ofthe counter-weight.

21. In an apparatus of the class described, the combination of a stylus, a diaphragm, a frame supporting said stylus and diaphragm, means for pivotally supporting said frame on one side of said stylus, a casing inclosing part of said frame, a counterweight pivoted within said casing, and means for connecting said counter-Wei ht to a part of said frame opposite the pivotal support of the latter.

22. In an apparatus of the class described,

the combination of a diaphragm, a phonographic stylus connected t herewith, a magnet for vibrating said diaphragm and stylus, and a washer located between the magnet and diaphragm to prevent accumulations of foreign particles between the adjacent surface of the magnet and diaphragm and to eliminate the sound of the diaphragm.

23. In an apparatus of the class described, the combination of a diaphragm, a phonographic stylus connected therewith, an electro-magnet for vibrating said diaphragm and stylus, said magnet havin a central core, and a felt washer located diaphragm and the electro-magnet and surrounding the magnet core, for the purposes setv forth. a

24. In an apparatus of the class described, the combination of a phonographic record medium, rotating means therefor, a stylus capable of engaging said medium, a diaphragm capable of operating said stylus, and an electro-magnet in which the value of the magnetic flux is normally substantially ml associated with said diaphragm, an electrical circuit containing a transmitter, a circuit switch, a source of direct current, and means for controlling said rotating means and simultaneously closing said ciretween thecuit switch so direct current may flow

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