The cage containing the scrap is then to be removed and end is split to admit of its contraction as the nut, B, is 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… … DRILLS AND ROSE BIT. DRILL CHUCK. TEMPERING. will permit of the temperature being nicely adjusted to suit the work in hand, and thereby prevent the volatilization of the metal, as, for example, when zinc is required to be re- covered, or otherwise injuring the substance under treat- ment. The scrap…
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