Cumming, Linnæus, b. 1843. [from old catalog] · New York, D. Van Nostrand · leaf 321
?02 Electricity. [Book III. dial outside. The motion of the pointer is usually checkedby two stops on the dial. (The dial is not shown in thefigure, being on the front of the instrument.) 199. Arrangement of Apparatus at TelegraphStation.—The arrangement of these parts at each stationcan be… … II II II II K Fig. 198. In addition to the essential parts described, there wasformerly an electric bell at each station to call the attentionof the clerk when a message is to be sent. This could easilybe done by a contact breaker, one branch of which containsthe bell, placed at any part of the…
Electricity
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