Practical wireless telegraphy; a complete text book for students of radio communication (1917)
Bucher, Elmer Eustice, 1885- · New York, Wireless Press, Inc · leaf 113
of spark elec-trodes to give a spark of this frequencywhen driven by a motor at speeds varyingfrom 1,800 to 2,400 revolutions per minute.A modified type of the non-synchron-ous gap is shown in Fig. 114 where tenstationary sparking points are mounted ontwo brass sectors. A light contact arm,A, B,… … Fig. 113—Non-synchronous Rotary Discharger. ROTOR CNSTATIONAIW^ ELECTRODES
Telegraph, Wireless
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