Cumming, Linnæus, b. 1843. [from old catalog] · New York, D. Van Nostrand · leaf 332
the currentstrength. By means of the attached silk threads, the move-ment of the syphon tube is made proportional to the] move-ment of the galvanometer coil, and the syphon recorder there-fore gives a permanent register of every change in strengthor direction of the line current. *208. Step by… … Fig. 204. complex machinery, but involve no new principle in elec-tricity. The only other form we shall refer to here is the ABCtelegraph, specially adapted for the use of persons who arenot familiar with any telegraphic code. The message isreceived on a dial marked with the twenty-six letters of…
Electricity
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