Cyclopedia of applied electricity : a practical guide for electricians, mechanics, engineers, students, telegraph and telephone operators, and all others interested in electricity (1905)
American School (Chicago, Ill.) · Chicago : American School of Correspondence · leaf 260
ntacts placed on the doors or windows so that the opening ofeither will cause the bell to ring. The same device may be usedon money-drawers, safes, etc. In the case of the electric lire alarm, the signal iiiav l>e tjiveneither automatically when the temperature reaches a certain degree,or pushes… … THE ELECTRIC TELEGRAPH. Apparatus and the Horse Code. In order to get the beginners point of view, it is taken forgranted tiiat the reader knows nothing of electricity or the prac-tice of telegrapliy. If there is a shght knowledge of either ofthese, so much the better; but as a starting-point, we…
Electrical engineering
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