US250308A - Henby b - Google Patents

Description

(No Model.) H. E. WAITB.

TBL'PHONB TRANSMITTBR.

Patented Nov. 29,1881.

UNITED STATES PATENT OFFICE.

HENRY E. WAITE, OF BRIDGEPORT, OONNEGTIOUT, ASSIGNOR TO CHARLES F. LIVERMORE, OF SAME PIJAOE.

TELEPHONE-TRANSM ITTER.

SPECIFICATION formng` part of Letters Patent No. 250,308, dated November 29, 1881.

Application filed June 8, 1881.

To all whom it may concern Be it known that I, HENRY EWAITE, of Bridgeport, county of Fairfield, State of Connecticut, have invented certain new and useful Improvements in Telephone-Transmitters,

of which the following is a full and exact description, reference being had to the accompanying drawings, making part ot' this specification, in which- Io Figure 1 is a plan or top view of my improved txansmitter with the cap-plate or cover removed, and Fig. 2 is a Vertical section through the same.

My invention relates to a novel arrangement [5 of the carbon or conductor plates of the transmitter; and it consists in the combination, with a grooved or flanged base-plate of carbon or equivalent material, of inclined plates of similar material resting upon said base-plate zo and forming a series of two ormorelight contacts, as hereinafter explained.

In the accompanying drawings, A represents a box or case, made, by preference, of cork; but it may be made of any non-resonant material, within which is placed a block orbaseplate, B, of carbon or other suitable conductin g material, made, by preference, with Vertical flanges b b' at the sides, as shown, and above these are suspended plates O C', either or both,

of carbon or its equivalent, said plates being pivoted at d by hooks or eyes, hinging' their upper edges to the side walls in such manner as to hold the plates pendent, with theirlower edges resting` againstthe inner faces of the flanges b b' or the base-plate B, in such manner as to give them the inclined position shown, in which the tendency of the weight of said plates to swing,` into a Vertical position keeps them in contact with the base-plate B at their 40 lower edges, as shown. Where but a single hinged plate is used the wires will be connected, one with said plate and the other with the base-plate; but where two are used the wires will be connected, one with one of said hinged plates and the otherwvith the other, as shown, the base-plate servingr to connect them. These plates, instead of being made in one piece, may be composed of several pieces or sheets resting one upon another, as shown at 0/, thus producing' the multiple contact or number of contacts described in another application, filed (No model.)

May 23, 1881, and the base-plate B may, if desired, be formed in a similar manner.

The form of the carbon pieces may be varied, of course, so long as the hinged and inclined relation of one part to the other is maintained, adapting it to rest in vibx'atory contact therewith, and the form ot' the box, case, or support A also may be changed, its essental feature of construction being` that it shall be adapted to support the carbon plates or conductors, one in a suspended and inclined relation to the other, as described, though the inclosing-case 'ofcork or eq uivalentnon-resonant material described is preferrcd, as in the latter construction the case serves, through molecular disturbance due to the action of the atmospheric sound-Wavesimpinging upon its surface, to convey such disturbance to the microphone. Vhere other material is used for the case the cover should be raised or left off, so as to expose the microphone to the direct ac; tion of the sound-Waves.

In the microphone described it will be readilyunderstood that whilethe parts thereof rest always in contact, such contact is more readily disturbed by the sound-Waves or molecular disturbance referred to than Where the parts are so arranged that one has to support the entireweight of the others, and the sensitiveness of the microphone to the action of the sound-Waves or under molecular disturbance is correspondingly increased.

Having` now Adescribed my invention, I claim 8 5 1. In a telephonetransmitter, the grooved or fianged block, of carbon or equiva-lent conducting' material, in combination with the inclined plates, of similar material, restingin contact with` said block on opposite sides thereof, substantally as described.

2. The combination,in a telephone-transmitter, of the fiang'ed block orbase-plate, ofcarbon or equivalent conducting material, and the laminated plates or leaves, of similar material, 93 suspended in an inclined position and resting thereon, for giving a light multiple contact, substantially as described.

HENRY E. WAITE.

Witnesses: t

CHARLES HANKINsoN, FREDERIG (J. BARTLETT.

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