ylindrical objects to be with equal advantage. It consists of a main portion, A, if not quite, as well as a twist drill. It is not a difficult which screws on the lathe spindle, and has a tapering drilled transversely, a fork, R, is inserted in the tail matter to make them, since we have such… … mass to a sufficient height to fuse the coating metal. pliers prevent the point from becoming heated. Another method, applicable to larger drills, is to employ a The effect of the centrifugal action is to discharge the FORMS OF DRILLS, notched block of lead, as shown in Fig. 2. The drill in this…
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