JN a properly-charged accumulator the negative plates should be light grey in colour, and the positive plates chocolate colour. [= should be an invariable practice directly a joint has been soldered io wipe it carefully with a clean duster so that all surplus flux is removed.
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https://paperspast.natlib.govt.nz/periodicals/RADREC19290222.2.74
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Radio Record, Volume II, Issue 32, 22 February 1929, Page 30
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45Untitled Radio Record, Volume II, Issue 32, 22 February 1929, Page 30
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