The principles underlying radio communication (1922)
United States. National Bureau of Standards, Ould, Richard Sheldon, 1889-, United States. Army. Signal Corps · Washington, Govt. Print. Off. · leaf 366
mentioned above, or if it is not convenient to mountthe gap on the generator shaft, it is customary to use a sepa-rate motor which runs without any special regard to the gen-erator speed. Such a gap is called a nonsynchronous gap andis usually operated at speeds giving from two to four sparksper… … ^+<sdiorvar>E.lec.t>-od«s Motor Rbtiry €^arK ^f) with tworotaitin^ electrodes 4mm f iq. 188
Telegraph, Wireless · Radio
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