Polarity Indicators
¥F,2. (Roseneath) writes: "Further to your article in the current number of the Radio Record on methods of finding polarity; a simple and reliable test, which does not need any elaborate mixing of chemicals, etc., can be performed by wetting NED
a small piece of ordinary blue-print paper and placing the two bared wires in close proximity thereon. The negative wire will immediately turn the paper white. I have found this method extremely handy on impromptu occasions, when other means of testing are not available, for there is nearly always a piece of an old blue print about which will suffice for the test. ed
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https://paperspast.natlib.govt.nz/periodicals/RADREC19300214.2.64
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Radio Record, Volume III, Issue 31, 14 February 1930, Page 30
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107Polarity Indicators Radio Record, Volume III, Issue 31, 14 February 1930, Page 30
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