IN front of the neon lamp is a 12--inch scanning disc of 48 holes, which scan from left to right and from top to bottom.
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https://paperspast.natlib.govt.nz/periodicals/RADREC19310206.2.4.1
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Radio Record, Volume IV, Issue 30, 6 February 1931, Page 1
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25IN front of the neon lamp is a 12-inch scanning disc of 48 holes, which scan from left to right and from top to bottom. Radio Record, Volume IV, Issue 30, 6 February 1931, Page 1
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