and netic quality to brass, and this circumstance makes it forced against the drill by the feed nut, which is turned by necessary to employ unhammered brass for compass boxes and similar apparatus. the left hand of the operator, who turns the crank gear with The expansion of brass has been very… … Some kinds of very fine brass are said not to be made by HARDISTY’S IMPROVED BREAST DRILL. cementation, but by a more speedy and direct union of copper and zinc, care being taken to prevent the access of be clamped to it by bars, as clearly shown in Fig. 2, or a the back of the ladder, the rails…
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