If a crystal decreases.in sensitiviiy it is often found that it can be restored by clipping a small picce off it _an¢d thus exposing a new surface, Never touch a crystal with the bare fingers. Hold it with a pair of clean tweezers or small pliers.
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https://paperspast.natlib.govt.nz/periodicals/RADREC19280113.2.43
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Radio Record, Volume I, Issue 26, 13 January 1928, Page 11
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46Untitled Radio Record, Volume I, Issue 26, 13 January 1928, Page 11
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