. Industrial Education Magazine . ise, as this will have a tendency to make theedge or point break off at these file marks whenhardened. Now file the bevel at about the angleshown at D, Fig. 1, and you are ready to harden andtemper. Place the bit of the chisel in a slow clean fire andgive it time to come to a low cherry red about \yiback from the point; then dip in clear water about1 down on the blade. Keep the chisel moving upand down just a little to keep from forming what isknown as a water line. This occurs when a pieceof steel is dipped in water and held stationary, andwill crack off at t
. Industrial Education Magazine . ise, as this will have a tendency to make theedge or point break off at these file marks whenhardened. Now file the bevel at about the angleshown at D, Fig. 1, and you are ready to harden andtemper. Place the bit of the chisel in a slow clean fire andgive it time to come to a low cherry red about \yiback from the point; then dip in clear water about1 down on the blade. Keep the chisel moving upand down just a little to keep from forming what isknown as a water line. This occurs when a pieceof steel is dipped in water and held stationary, andwill crack off at this line. As soon as the chiselhas cooled so the water remains on the part of thebit you have dipped, brush off the water and allowthe heat to run down until the moisture has allgone; then brighten one side of the blade with a file,sandpaper or sandstone. The heat in the base ofthe chisel should be enough to draw the temper. After brightening the side (this brightening opera- PROJECTS, PROBLEMS AND NOTES 163 h rl H SCOOTED hJ HpO. TELEPHONE SHELF f . -5- ^— > - - r ri i1 t / j. T_H j 34 J GLASS OVER NUMBER
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Keywords: ., bookcentury1900, bookdecade1910, bookidindustrialed, bookyear1910
