Cumming, Linnæus, b. 1843. [from old catalog] · New York, D. Van Nostrand · leaf 319
pper cell is still used, and Leclanch6s aregradually coming into use. In what was called the magneto-telegraph, the battery was replaced by some form of magneto-machine which generated the current. 197. The Single Needle Telegraph Communi-cator.—This consists of a commutator by which the current… … Fig. 195. The diagram (Fig. 195) shows such a commutator. Itconsists of two brass springs, having ivory buttons on theirends. When at rest they press upwards against two metal I EARTH LINE —ft LINE. TTY& BATTERY -T BATTERYa DEPRESSED
Electricity
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