Modern electrical construction; a reliable, practical guide for the beginner in electrical construction, showing the latest approved methods of installing work of all kinds according to the safety rules of the National board of fire underwriters (1905)
Horstmann, Henry C[harles], 1858- [from old catalog], Tousley, Victor Hugo, 1875- [from old catalog] joint author · Chicago, F. J. Drake & Co. · leaf 26
itter are: the diaphragm, a; an electriccircuit, containing a battery, b, and consisting of the wires,c, c^ and partly wound upon an iron core, d. This electric circuit, it will be seen from the figure, con-nects with one pole to the diaphragm, a, and with the otherto a small metal plate, e.… … Figure 7 the sound waves cause the diaphragm, a, to vibrate; the rateof vibration and character of the vibrations being an exactduplication of the voice speaking into it. These vibrationscause the small pieces of carbon between the diaphragm andthe back plate to be alternately compressed and…
Electrical engineering
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