Cumming, Linnæus, b. 1843. [from old catalog] · New York, D. Van Nostrand · leaf 373
close proximity to the mouth of thereceiver. The instrument is also peculiarly liable to dis-turbance from induction in the circuit; the make or breakof contact in a telegraph wire, parallel to the telephonewire, but 20 feet distant, causing a harsh grating soundin the telephone, altogether… … Fig. 233. chap, vi.] Current Induction. 355 wire being united with the direct, though of course insulatedfrom it. It will easily be seen that the telephone of Graham Bell isa very sensitive galvanoscope, and may be substituted for agalvanometer in many cases where a delicate adjustment isrequired,…
Electricity
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