Increased Efficiency
ee An Earthing Improvement NOVEL earth, and one that gives excellent results, may be made from 6 feet or so of copper gas tubing, about 3 inch in diameter. With a fine bradawl, pierce small holes in the whole length of tubing, then form it into a spiral coil about 6 inches in diameter, and bury it with one end just protruding. To this end the earth lead, is soldered. The’ edges of the tube are then hammered out into a small funnel, into which water may be poured from time to time.
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https://paperspast.natlib.govt.nz/periodicals/RADREC19291011.2.53
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Radio Record, Volume III, Issue 13, 11 October 1929, Page 25
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95Increased Efficiency Radio Record, Volume III, Issue 13, 11 October 1929, Page 25
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