search, and arranged with special reference ta the practical application of lution of the saw, and the saw has 30 teeth, of steel, nicely fitted and hardened, and are physical science to the arta and experiences of every- each tooth must cut one-twenticth of an inch. day life. By David A. Wells, A.… … pressing against the body of the saw; there- stronger, and on that account better adapted be filed. up sharp, finishing with a fine, single- OF THE fore, the flange that is fast on the mandrel to upsetting heavy saws. SCIENTIFIC AMERICAN. cut file. The cutting edge of each tooth should be a little…
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