Useful Tips
{Ff your moving-coil speaker is one incorporating a permanent magnet, do not forget that if you place your watch near it it may become magnetised, with disastrous resylts to timekeeping. jf you are troubled with a_ loudspeaker locking nut loosening, and so setting up chatter, remember it can be permanently secured after it is tightened by a little adhesive run into it, or even by a spot of candle grease.
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https://paperspast.natlib.govt.nz/periodicals/RADREC19310116.2.49
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Radio Record, Volume IV, Issue 27, 16 January 1931, Page 16
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72Useful Tips Radio Record, Volume IV, Issue 27, 16 January 1931, Page 16
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