American telegraphy and encyclopedia of the telegraph; systems, apparatus, operation (1909)
Maver, William, jr. [from old catalog] · New York, Maver publishing company · leaf 319
, From the foregoing it is clear that a desideratum in submarine tele-graphy is a receiving instrument which shall respon i to very feeble currents, since thefeebler the current required the shorter will be the time of charging and, consequently,discharging the cable, and, hence, the more rapid the… … THOMSON SIPHON RECORDER. be made responsive to very feeble currents. In the operation of this method the gal-vanometer is placed in the circuit of the cable and hence is responsive to signals trans-mitted over that circuit. The spot of light reflected from the mirror is thrown on ascreen in a…
Telegraph
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