Henry and Hora's modern electricity; a practical working encyclopedia (1915)
Henry, James. [from old catalog], Hora, Karel Jan, 1881- [from old catalog] joint author · Chicago, Laird & Lee, inc. · leaf 265
pressure, whichtransmit electrical impulses more effectively. Fig. 115 showsa section of the Blake transmitter. In this instrument the diaphragm a, surrounded by arubber ring k, is fastened behind the aperture of themouthpiece b. A short piece of platinum wire c, fixed toa fine spring d, touches… … may be adjusted by a screw h. Electrical impulses beatingagainst the diaphragm, press to a greater or lesser degreethe platinum wire c, against the carbon button e, thus varyingthe resistance of the contact. When this transmitter is con-nected into a circuit, the current of a battery passes…
Electrical engineering
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