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Scientific American, Vol. 13, No. 15 (1865) (1865)

leaf 7

An illustration from Scientific American, Vol. 13, No. 15 (1865), 1865, leaf 7
which should take a piece of steel turned a hole is bored through cast or wrought iron, is sur- to size, and complete a drill ready for hardening, al- prising. These are first-class goods, and are now in most at one operation. This was effected in May, use in most of our large shops, armories and… … or formed as to present a straight cutting edge to the Morse Twist Drill and Machine Qo. All siaes of drills caught and firmly held. This pln is applied at either metal, with a decrease in the angle of the groove as up to half-inch always on hand. The larger sizes side of the bow, where it presents…

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