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      The Sciences

      Home-made Oil Filters, Workshop Notes and more

      • By Frederick E. Ward on October 5, 1912
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      ABOUT THE AUTHOR(S)

        Recent Articles by Frederick E. Ward

        • A Radio Generator for Amateurs
        • A Variable Condenser, Construction of an Oxygen Carbon Remover
        • Setting a Watch, Our Front-cover Illustration, and more
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