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Scientific American, Vol. 55, No. 15 (1886) (1886)
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and its botton withdrawn, its contents falling into each block containing twelve longitudinal apertures, mixing tanks on the lower floor. Melted pitch is fed the mould. After six or eight inches have been filled, in the same general way into the same vats, and the 21g inches in diameter. Each of… … © 1886 SCIENTIFIC AMERICAN, INCInternet Archive · Public domain (published before 1931). Free to use for anything.
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