Hardening Drill Steel with the Radiation-Type Thermocouple

IN January, 1939, Dome Mines, Limited, purchased a few bars of an alloy drill-steel for the purpose of testing its fatigue resisting qualities as compared with those of a straight carbon-steel then in general use at the mine.
Keywords: alloy steel, galvanometer, octagon, pyrometer, Thermocouple, Alloy steels, Carbon, Drill, Drills, Lens, steel, Steels, Temperature
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