The top illustration shows a section of undamaged record. The large curves are bass notes. The centre portion illustrates the way grooves can be damaged by thick needles. The effect of this wearing process, and the dust collected from the record, is shown on the needles.
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https://paperspast.natlib.govt.nz/periodicals/RADREC19301205.2.23.2
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Radio Record, Volume IV, Issue 21, 5 December 1930, Page 9
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46The top illustration shows a section of undamaged record. The large curves are bass notes. The centre portion illustrates the way grooves can be damaged by thick needles. The effect of this wearing process, and the dust collected from the record, is shown on the needles. Radio Record, Volume IV, Issue 21, 5 December 1930, Page 9
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