split to admit of its contraction as the nut, B, is replaced by another charged with fresh scrap, and the oper- preserve the hardness of the cutting edges while the temper screwed on. The part. A, is bored longitudinally to receive ation may then be repeated. Instead of using a central fire is… … DBILLS AND BOSE BIT. DBILL CHTTCK. TEMFEBINO. holding drills, the pieces, C, are inserted in the chuck, cen- will permit of the temperature being nicely adjusted to suit cury instead of water, it acquires a diamond-like hardness. tered with a pointed tool, and are drilled with the drill with the…
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