American telegraphy and encyclopedia of the telegraph; systems, apparatus, operation (1909)
Maver, William, jr. [from old catalog] · New York, Maver publishing company · leaf 247
, which is the time required for the current or the magnetism to reacha certain fractional part of its maximum strength, namely, the ^Vu¥ of that value^The time constant is equal to the self-induction of the circuit or relay divided byits resitetance. The henry is the unit of self-induction and it… … if a relay on short-circuit has a current of i ampere flowing through its coil and ifthe lines of force set up by this current fall from maximum to zero in i second andin doing so set up an electromotive force of i volt, the self-induction of the relayis I heury. Referring to the time constant, if…
Telegraph
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