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Scientific American

September 1, 1941

1 min read

For Checking Water Purity

Electrical Equipment Gives Constant Check, Sounds Warning or Automatically Adjusts

By Nathan Schnoll

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Scientific American Magazine Vol 165 Issue 3This article was originally published with the title “For Checking Water Purity” in Scientific American Magazine Vol. 165 No. 3 (), p. 127
doi:10.1038/scientificamerican0941-127
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