Lynde, Carleton John, b. 1872 · New York, Macmillan · leaf 195
Door Drawing Room Dining RoomFIG. 129. — Bell circuits. i8o PHYSICS OF THE HOUSEHOLD … The electric telegraph. — The tele-graph is one of the most importantelectrical servants of mankind. It isanother application of the electro-magnet. The equipment of a tele-graph station usually consists of asounder, key, relay, and batteries. The sounder (Fig. 130) gives themessage. The important…
Physics · Home Economics
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