. The 20th century toolsmith and steelworker; a complete, practical, and scientific book. more or less experi-ence by having them crack, bear this in mind, that itis not the water which causes them to crack, as a greatmany may suppose, but instead by the fire, for ifa stone hammer becomes overheated in the fire, espe-cially when heating to harden, there will be cracks in 148 THE TWENTIETH CENTURY it, and if they dont show up the first time afterquenching, they will the next, and this informationlikewise applies to other tools. Sometimes when work-ing on soft stone, some masons prefer a stone h
. The 20th century toolsmith and steelworker; a complete, practical, and scientific book. more or less experi-ence by having them crack, bear this in mind, that itis not the water which causes them to crack, as a greatmany may suppose, but instead by the fire, for ifa stone hammer becomes overheated in the fire, espe-cially when heating to harden, there will be cracks in 148 THE TWENTIETH CENTURY it, and if they dont show up the first time afterquenching, they will the next, and this informationlikewise applies to other tools. Sometimes when work-ing on soft stone, some masons prefer a stone hammermade with a hollow face, as indicated by dotted linesin Fig. 82. Miners* Tools. As there is a great amount of mining going onthroughout the country, first-class sharpeners of min-ers tools are in great demand; and likewise receivehigh wages. The principal tools used by miners aredrills, which may be divided into two classes, as, thehand drill and the cross or machine drill. To make a good fast cutting hand drill, notice theshape of the drill in Fig. 83. I have had drills of this.
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