Hardening, tempering, annealing and forging of steel; a treatise on the practical treatment and working of high and low grade steel .. . any grade of temper, and a bright, clean and perfectlyuniform temper color is obtained when the work has been properlyprepared for coloring by thorough cleansing. The capacity of the machine depends upon the size and weightof the articles, but as a criterion for its efficiency we can say thatwe have witnessed bicycle chain blocks and insertable saw teethbeing put through at the rate of 150 pounds per hour. The work is placed in the hopper, X, containing a sma
Hardening, tempering, annealing and forging of steel; a treatise on the practical treatment and working of high and low grade steel .. . any grade of temper, and a bright, clean and perfectlyuniform temper color is obtained when the work has been properlyprepared for coloring by thorough cleansing. The capacity of the machine depends upon the size and weightof the articles, but as a criterion for its efficiency we can say thatwe have witnessed bicycle chain blocks and insertable saw teethbeing put through at the rate of 150 pounds per hour. The work is placed in the hopper, X, containing a small scoop,which at every revolution deposits a measured quantity into a fun-nel leading into the heating drum. This drum, contained in themain body of the machine, is provided with a spiral way whichgradually propels the work to discharge Z. The spiral partitions are inclosed by a perforated cylinder,through which sand or flint heated to the proper temperature to HEATING STEEL GAS BLAST FURNACES. 79 obtain a desired temper or color is constantly sifted upon thev/ork. Provisions are made to keep a sufficient quantity of sand stored. FIG. 45.—HEATING MACHINE; FOR TEMPERING AND COLORING. above the work, so as to secure its even distribution into all thespiral divisions of the drum, thus effecting its uniform action uponthe work. The outer casing of the drum is subjected to an evenly distri- 8o HARDENING, TEMPERING AND ANNEALING. buted heat, controlled by proper adjustment of the gas valve, G^and the air valve, B. The speed at which the work passes through the spiral drum isregulated hf a friction cone placed above the machine, and thetemperature by reference to the thermometer, I. By noticg the temperature at which differjnt colors are ob-
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Keywords: ., bookcentury1900, bookdecade1900, bookidhardeningtem, bookyear1903
