To Lessen Friction in Machinery.
Grind together black lead with four times its weight of tallow. Camphor is sometimes used, 7 lh to the hundredweight.
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https://paperspast.natlib.govt.nz/periodicals/P19070401.2.50
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Progress, Volume II, Issue 6, 1 April 1907, Page 235
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25To Lessen Friction in Machinery. Progress, Volume II, Issue 6, 1 April 1907, Page 235
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