. The 20th century toolsmith and steelworker; a complete, practical, and scientific book. en and temperas a point or chisel already mentioned. A drill forged. Fig. 63. The granite hand drill, illustrating flat and sideviews of the bit. hammered, hardened and tempered properly, will drilltwo holes 3I/2 inches deep. I have had them put in asmany as four holes 3%- inches deep, but a drill im-properly hardened or overheated will not put in onehole, besides tiring the driller much quicker. Bull Sets and Bull Chisels. Bull sets and chisels are dressed and hardened as astone hammer, with the exceptio
. The 20th century toolsmith and steelworker; a complete, practical, and scientific book. en and temperas a point or chisel already mentioned. A drill forged. Fig. 63. The granite hand drill, illustrating flat and sideviews of the bit. hammered, hardened and tempered properly, will drilltwo holes 3I/2 inches deep. I have had them put in asmany as four holes 3%- inches deep, but a drill im-properly hardened or overheated will not put in onehole, besides tiring the driller much quicker. Bull Sets and Bull Chisels. Bull sets and chisels are dressed and hardened as astone hammer, with the exception that only one endis dressed, the other end being a chisel head which isleft unhardened for the sledge to strike upon. A bullset is made the same shape as the face end of a stonehammer. The bull chisel resembles the flat or tapered TOOLSMITH AND STEELWORKER 125 end. Stone hammers will be found fully explainedand illustrated in another chapter of this book. The Granite Biish Hammer. The cutting part of a granite bush hammer is com-prised of thin flat blades, which are held in place by. v^ V ? Front view. U Li A Side view.
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