Useful Hints
, -_-- WHEN laying aside a spare variable condenser don’t forget‘ that to ‘wrap it in clean paper will save endYess trouble in remoying dust from the vanes. WHEN holding a threaded metal rod in a vice, remember that stiff brown paper wrapped round it will protect the thread from injury.
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https://paperspast.natlib.govt.nz/periodicals/RADREC19311218.2.29
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Radio Record, Volume V, Issue 23, 18 December 1931, Page 17
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51Useful Hints Radio Record, Volume V, Issue 23, 18 December 1931, Page 17
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