The design and construction of a practical wireless telegraph station (1910)
Spurck, Robert Michael, Wheatlake, Burton Cyrenius Job · leaf 51
aper basket sixteen inches long and fourteen inches in diameter.Around this was wound a nineteen inch helix of five turns of num-ber eight rubber covered copper wire, each turn being insulatedfrom the other by the insertion of a cake of paraffin one and ahalf inches thick. The spark gap was made by… … f 23 and six and a half inches long. One ball was rigidly fixed andthe spark gap made adjustable by moving the other ball by means ofa screw. See Figure (15).
Telegraph stations · Telegraph, Wireless · Theses
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