Electricity for public schools and colleges (1891)
Larden, W. (Walter), b. 1855 or 6 · London : Longmans · leaf 444
tlL … Fig. ii. \2) The electric sounder.—This instrument {see fig, ii.) is verysimple in construction. The current from the sending station passes E E 4i8 ELECTRICITY CH. XXV. through the coils of the electro-magnet, and the iron keepera is attracted downward. This causes the other end of thelever to hit…
Electricity
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