Telegraph engineering : a manual for practicing telegraph engineers and engineering students (1922)
Hausmann, Erich, 1886- · New York : D. Van Nostrand Company · leaf 29
0.00003340.00002680.0000227 14 TELEGRAPH ENGINEERING When a constant electromotive force is impressed on theterminals of a relay or sounder the current does not in-stantly assume its ultimate value because of the inductanceof the electromagnet. As the inductance of a windingsurrounding iron depends… … Fig. 9. shows the growth of current strength in a typical relay asobtained experimentally by means of an oscillograph. Ab-scissas represent time — one inch corresponds to 0.037second; ordinates represent current strength — one inchcorresponds to 0.030 ampere. The upper curve shows thecurrent in the…
Telegraph
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