Cumming, Linnæus, b. 1843. [from old catalog] · New York, D. Van Nostrand · leaf 326
and, when drawn up by the magnet, markswith its edge the paper passing in front of it, thus perma-nently printing the message sent. *203. The Morse Relay.—In long land lines the currentbecomes much weakened by leakage, due to imperfect insu-lation, and it is not strong enough to work the Morse… … Fig. 201. In the diagram (Fig. 201), A is an electro-magnet throughthe coils of which the original current passes to earth. Thesoft iron armature is carried by a brass arm which is lightlysuspended on a pivot (J3), and has its motion controlled bythe two screws, &, b, of which b is insulated by…
Electricity
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