Cumming, Linnæus, b. 1843. [from old catalog] · New York, D. Van Nostrand · leaf 320
?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…
Electricity
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