Hardening, tempering, annealing and forging of steel; a treatise on the practical treatment and working of high and low grade steel .. . covering such parts as are not to be case-hardened with fire-clayor some other non-carbonaceous material. The retort beingpacked it is let down into the furnace from a suitable crane over-head, and the cover, K, put in position as shown, when the furnaceis ready for operation. The distribution of the heat evenly from the bottom to the topof the retort is effected by two independently controlled sets ofburners; the lower set by the valves G2 and A2, and the up
Hardening, tempering, annealing and forging of steel; a treatise on the practical treatment and working of high and low grade steel .. . covering such parts as are not to be case-hardened with fire-clayor some other non-carbonaceous material. The retort beingpacked it is let down into the furnace from a suitable crane over-head, and the cover, K, put in position as shown, when the furnaceis ready for operation. The distribution of the heat evenly from the bottom to the topof the retort is effected by two independently controlled sets ofburners; the lower set by the valves G2 and A2, and the upper setby the valves G3 and A3, while the common supply valves areGi and Ai. G stands in each case for gas and A for air. The proper adjustment having been made on the lower andupper sets of the burners so as to secure an approximately correctdistribution of the heat, the main gas and air valves are aloneutilized to control the temperature, and the distribution of theheat properly over the whole length is then effected by the twovents, one in the bottom indicated by M2, arxi one on top in the 86 HARDENING, TEMPERING AND Vl( 50.—CYLINDRICAI. CASE-HARDENING FURNACE FOR CASEHARDENING CAR AXLES. HEATING STEEL—GAS BLAST FURNACES. 87 center of the cover, K. The top vent being closed entirely, theheat is driven downward and the products of combustion escapethrough the vent, N2. If N2 is closed and cover vent wide open,the heat is forced upward too rapidly, but by partly closing bothvents, as much as will be found necessary from observation, a
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Keywords: ., bookcentury1900, bookdecade1900, bookidhardeningtem, bookyear1903
