American telegraphy and encyclopedia of the telegraph; systems, apparatus, operation (1909)
Maver, William, jr. [from old catalog] · New York, Maver publishing company · leaf 399
varied, and its oscillation period thereby be made to correspond with that of the cir-cuit o, of the oscillator, which includes the primary wire ;j of t; c is an adjustablecondenser of very small capacity, by varying which the oscillation period of the circuitmay readily be varied. Leyden jars are…
Telegraph
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