. The 20th century toolsmith and steelworker; a complete, practical, and scientific book. Fig. 21. The hot or splitting chisel. blows with a sledge, then turn over the chisel and goover this side the same way, which will have the sameeffect on the steel as hammering with a hand hammer,and be better, as the blows will be much heavier, butbe sure that the flatter comes in contact with the ex-treme cutting edge. A railroad chisel is made from 1%-inch square should not be made entirely square across the cuttingedge as an ordinary chisel, but should be ground or 66 THE TWENTIETH CENTURY fi
. The 20th century toolsmith and steelworker; a complete, practical, and scientific book. Fig. 21. The hot or splitting chisel. blows with a sledge, then turn over the chisel and goover this side the same way, which will have the sameeffect on the steel as hammering with a hand hammer,and be better, as the blows will be much heavier, butbe sure that the flatter comes in contact with the ex-treme cutting edge. A railroad chisel is made from 1%-inch square should not be made entirely square across the cuttingedge as an ordinary chisel, but should be ground or 66 THE TWENTIETH CENTURY filed rounding at the corners, as in Figure 22, whichwill make them more difficult to break and also givebetter satisfaction. If the cutting edge is tapered infrom the sides to 1% inches across the cutting edge, itv/ill cut deeper when struck with a sledge or hammerand will be more convenient to get in the corners of. Fig. 22. The railroad chisel. the rail than if the cutting edge was the full width ofthe body of the chisel. Drills and Drilling. Drills are in great demand, both in the machine andblacksmith shops, but where drilling by hand power is TOOLSMITH AND STEELWORKER 67 performed, is where good, fast and easy cutting drillsare especially necessary. As in my first years at thetrade, I had a great deal of practice drilling by hand,and with drills that were always breaking or being toosoft, consequently putting the hole through often bymain strength and energy, and other times with thedrill squeaking by losing its cutting edge on the cornersof the bit after drilling a few holes. A great many blacksmiths prefer using machine-made drills rather than make a flat drill, because theysay a flat drill will not do the work of a machine drill,and if they are asked the reason why they will say thatthe ones they buy in a hardware store are secrettempered or give some other reason, and often theywill reply
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