Hardening, tempering, annealing and forging of steel; a treatise on the practical treatment and working of high and low grade steel .. . CIRCULAR OIL TICMPERING FURNACB. to that of a soft metal furnace. The pot is 10^ inches in diam-eter, 10 inches deep, and the temperature is regulated by referenceto the thermometer, T, held in place by the clamp, K. The bulbof the thermometer extends below the middle of the bath, and theburners are arranged to distribute the heat with perfect evennessaround the pot. For small work a wire basket is used to contain the articles tobe treated, while larger work
Hardening, tempering, annealing and forging of steel; a treatise on the practical treatment and working of high and low grade steel .. . CIRCULAR OIL TICMPERING FURNACB. to that of a soft metal furnace. The pot is 10^ inches in diam-eter, 10 inches deep, and the temperature is regulated by referenceto the thermometer, T, held in place by the clamp, K. The bulbof the thermometer extends below the middle of the bath, and theburners are arranged to distribute the heat with perfect evennessaround the pot. For small work a wire basket is used to contain the articles tobe treated, while larger work is suspended in the bath in any con-venient way. The temperature being under the perfect controlof the gas and air valves, G and A, the bath is heated until thethermometer shows the proper heat. When work is submergedin the bath it cools down, and the work remains there until the 84 HARDENING^ TEMPERING AND HEATING STEEL—GAS BLAST FURNACES. 85 temperature rises again to the original degree, when the workis removed. Heating Machine for Hardening Chain. This machine shown in Fig. 49 is one of many heating devicesbuilt for special purposes. The idea successfully accomplished in this machine is to hardenchains made from sheet steel, which passes from reel Ri firstthrough the heating space into the cooling bath and is received onreel R2 perfectly and uniformly hardened. By the accurate adjustment of burners and speed of travel aperfect uniformity in hardness of all the links is secured, thecooling bath is kept at a uniform temperature by proper circula-tion of the water or oil, which is drawn off the top, and after cool-ing is pumped back into the bath at the bottom. After the chainis hardened and wound upon the reel the whole reel is insertedin an oil tempering furnace to be drawn to the exact temperrequired. Cylindrical Case-Hardening Furnace. Furnaces of the type shown in Fig. 50 are use
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Keywords: ., bookcentury1900, bookdecade1900, bookidhardeningtem, bookyear1903
