US1049253A - Sound-transmitting apparatus. - Google Patents

Description

v K C. W. MGGONIGLE.

' SOUND 'rnANsm'T'rmG APPARATUS.

APPLICATION Y"ILIBD YEB.5, 1912.

1,049,253'. Patented Dec. 31, 1912. l

' A A rron'zmsrA t y l'iAirErrr onirica,

i Wl.' M cGoNGLE, orIALGoNA, wilsi1ivewro1v,A Assmnonl To THEGLOBE TELE- f f PHONE comPANY; oF SEATTLE, WASHINGTON, A CORPORATION or WAsHINGToN.

' 'igogtogss.

' To'all pwi it may'convcam: l Y Be it known that 1;.. CHARLES. W .MC -GoN1GLi-:, azcitizen .of the United States, re-

lo'w'ing is a specihcation. 5

' i-ons' is' especially designed for-use witll the receiverof an iordinary.telephone system, o r with a wireless telephone by connecting the l'f-thewireless systeml' A i The bject of theinvention 1s the perfeqting of {devices of this character whereby the 'transmission of sound is rendered peculiarly e fect ive..' A The 'invention is.illustrated by the accom- '-Qpanying drawing, which shows in section a sound transmit-ter witlrthe electricalA circuits A therefor shown diagrammatically.'

I The Vreference` numerals 2 and 2'. designate-two diaphiiagn'is "secured 'about their peripheries to vthe `ends of' a hollow -suppc rt .3 there-for. Communicating with the space -within said supportis a horn .4. 'Attachedto .the respective diaphraguis andv exttmdingv 130ax'i'ally therefroniare metallic rods 5 and 5 which areccnneetedby wires aand a. with a sourceof direct current electr-ic supply, asv

c indicatedat- B. Secured to 'said rods ar'e disks v(ii-servingfas electrodes for the circuit B'meinbers'comprised .of the respective wires and, rods. Associated with each' of said disks are stationary metal plates l'i' and 7' -wliich serve asl electrodes for circuit. wires I)v 'fand b,^ res1v)ecti.vely. The latter are :con- 40, nected in -parallel with a telephone receiver A"-R,vo'r an -equivalent,jand desirablythrough the instrunientalityof atransforiner o r an Ainduction coil' T,having a primary 'winding offre'lativelyf low resistance'.- Thefpl-ates 7 A51-and 77 are disposed in spaced relations at opposite sides'of the respective disks and are `inclosed in receptacles such-as 8, 8582 and liiaterialyindicat'ed by 9,.' are 'provided belllnt'een the.- .and the' various associated plates.

" y In operation, the' 'iindulator y movements of.' the gdiaphragms generated by sound' i; resulting 'in the granular 0 c g. ing varying 4amounts of sidlng at Algona; 1 n the county. of King'and'} :15j State. of Washingtoin' have.A inventedcertain tiode's Tand-17.. =tpnlsestthnsltransmitted.through the eleei8'*.`z Granules offcarbomoran"equivalent- S-pecitcation'of Letters lateiiti Patented piilication filed I EeliriiaI'y 5,l 1 912. i

site sidesof the movable electrodesii'itl'ordflow of electric currents or impulsev `the ilG-riiiall)Y .incomplete local c" to'ftlie circuit connections b, Z4v 'of th The series of'el'ecl trodesare'of an :alternatingr e .icterand arejthus applied'througli the medium of the induction coils T to the circuit wires of the receiver R.

trod 6 which are' connected therewith arecaused to approach the electrodesv T wherev` 9- is lessened between the referred to electrodes with a'proportioiial increase in tht` resistance afforded by the said medium with respect to electrodes Gand T. Consequently.

as the'niovable electrodes (3 are alternatelj:

brought into proximity of the stationary electrodes. it is evident that alternating eur rents are produced in the circuit wiresl L. lf.' ll'heirthe electrodes t3- are brought into neutral positions wvitlrrespect te the other electrodes, as would be the condition when the diaphragins are uninluenced 'b v. sound waves,A the wires bpb would be short-eircuited between the various movable eleetrodes and all ot' the otlieis and lienee be ineffective at the receiver.

The number olf groups of transmitting! elements `composed of an electrode (i inter# posed between the granular 4matter and the adjacent Afixed electrodes may be varied to siutthe service or according-to the amper` ageV or current supplied.'

By such devices a relativel) strong-cin'- rent, asGOO volts. for example. may be'exnployed and that, too, from a circuit which is utilized for supplyingv power directly to electric motors and without injuring the certainty and definition' of `the sounds. transmitted the instrument.l

*What I'clam as my invention.. is-

= V1'. In apparatus of the class dessrihed. the combination -of two vibratile diapliragius.

pairs-of iioii-iiim'alile 'electrt-des disposed :it

stitutingr the terminals ofthe primary wind- Aingof an induction coil. a movable elet-trede -More particularly, when the,A c diaphragnis are pressed outwardly the elecinstrument withvthesending appliances of resista-nce: tio the sfo A .752 upon the resistancetitlorded b v the nie\'liu.in

positioned intermediate die-aforesaid eleetrodes ofeacli pail-a granular medium disposed in the'spu'ces between tlieinm'able elec- -trodes and the non-movable electrodes, posi-A tive connections between the movable electrodes and the respective diaphra and the complementary circuit wires olzs direct current electr-ic 'supply connected with ,the respective movable electrodes. Y

2. In apparatus of the class described, the combinationof a pair of spaced diaphragms' adapted to be vibrated in opposite directionswhen influenced by sound waves2 resistance chambers disposed at opposite sides of the aforesaid pair of Vdiaphragms, a non-mov` able electrode 4ai: each end of t-helres ective resistance chambers, -a primary wind) aninduction coil,` one of the terminalsv o'f said Winding being connected to the electrodes adjacent. to the diaphragms at one.A

ing ofl vside of the lat-terand alsowlth the electrodes A Jan., 1912.

remote'rom the diaphragm's at the opposite `Side,'the other terminal of said winding being similarly connected with the remaining of said electrodes, a movable electrode inter-v posed between the two electrodes ofeach of the resistance chambers, rods connecting thesite lsides of the pair'of diaphragms.

'- Signed at Seattle, Wash., this 30th Aday of CHARLES W. .MGGONIGLE

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