Telegraph engineering : a manual for practicing telegraph engineers and engineering students (1922)
Hausmann, Erich, 1886- · New York : D. Van Nostrand Company · leaf 71
the left. In practice polarized relays usually have resistances offrom 50 to 500 ohms, and will operate satisfactorily oncurrents of from 5 to 200 milHamperes. When traversedby currents of from 10 to 15 milliamperes, the inductancesof such relays are from 1.5 to 6 henrys when the air gapbetween…
Telegraph
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