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Scientific American, Vol. 71, No. 7 (1894) (1894)
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been known to con- the steam and water to act against, and also to pre- many people would naturally think it might be the de- struct a tunnel three miles in length, a labor for them vent back pressure. In the ends of the piston, and near its outer periphery, are packing rings made up proportionate… … © 1894 SCIENTIFIC AMERICAN, INC.Internet Archive · Public domain (published before 1931). Free to use for anything.
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