Hardening, tempering, annealing and forging of steel; a treatise on the practical treatment and working of high and low grade steel .. . 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. l^IG. 51.—CYLINDRICAL CASE-HARDENING F
Hardening, tempering, annealing and forging of steel; a treatise on the practical treatment and working of high and low grade steel .. . 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. l^IG. 51.—CYLINDRICAL CASE-HARDENING FURNACE. 88 HARDENING, TEMPERING AND ANNEALING. perfectly uniform distribution of the heat is effected without avery close adjustment of the relative strength of the upper andlower burner tiers. The regulation of the distribution by the vent holes is espe-cially important when the temperature is to be raised quicklyand the burners turned on as full as possible in both tiers. Each row of burners has three burner tips, F, as shown, which
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Keywords: ., bookcentury1900, bookdecade1900, bookidhardeningtem, bookyear1903
