Sections of a layer-built and an ordinary "B" battery. Of the latter, each cell delivers 1½ volts.
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https://paperspast.natlib.govt.nz/periodicals/RADREC19310717.2.41.3
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Radio Record, Volume V, Issue 1, 17 July 1931, Page 17
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17Sections of a layer-built and an ordinary "B" battery. Of the latter, each cell delivers 1½ volts. Radio Record, Volume V, Issue 1, 17 July 1931, Page 17
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