Cyclopedia of Useful Arts, Vol. 2: Mechanical and Chemical, Manufactures, Mining, and Engineering; Hammer to Zirconium (Classic Reprint) - Hardcover

Charles Tomlinson

9780428852047: Cyclopedia of Useful Arts, Vol. 2: Mechanical and Chemical, Manufactures, Mining, and Engineering; Hammer to Zirconium (Classic Reprint)

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ISBN 10: 0428852041 ISBN 13: 9780428852047

Publisher: Forgotten Books, 2018

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Excerpt from Cyclopedia of Useful Arts, Vol. 2: Mechanical and Chemical, Manufactures, Mining, and Engineering; Hammer to Zirconium

The raising-nammer, fo'r raised works in metal, is rounded at the Edge, and of various forms. The planisfiz'ng-lzammer has a flat smooth face the gold eealer's lnzmmer, a somewhat rounded one; the back bummer, for correcting distortions which so commonly occur in hardening steel goods, terminates at each end in an obtuse chisel edge. The hack-hammer used for hacking grindstones is a small adze of 2 or 3 lbs. Weight, but longer and more curved in the blade, and with a very short handle. Its use is to hack or notch the high places which occur in large grindstones, in regular work, and arise from unequal wear. For this purpose the high places are marked by holding a piece of chalk or charcoal steadily upon the horse, and bringing it gradually near the stone before it comes to rest, the strap having been thrown off. The grinder then cuts shallow oblique furrows, about an inch apart, in the high places denoted hy'the marks, and crosses them with others so as to produce a chequered surface. On again using the stone the greatest wear occurs at these roughened places, and thus the stone is restored to its true form.

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