A WEEKLY JOURNAL OF PRACTICAL INFORMATION IN ART, SCIENCE, MECHANICS, CHEMISTRY AND MANUFACTURES. NEW YORK, FEBRUARY 20, 1864. { SINGLE COPIES SIX CENTS. Vol. X.—-No. it $3 PER ANNUM—IN ADVANCE. (NEW SERIES.) Machine for Rifling Gun Barrels. The frame or bed, A, supported by the legs, B B, is and…
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