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Scientific American, Vol. 62, No. 10 (1890) (1890)
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iar result is the the periphery, they can be clearly distinguished. A comparatively little difference in tractile power due to the use of sand in the case of the polygonal wheels. The disproportion in theloads moved by the polygonal it passes from face to face. and circular wheels is very striking… … © 1890 SCIENTIFIC AMERICAN, INC.Internet Archive · Public domain (published before 1931). Free to use for anything.
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