. Electric railway journal . RAILWAY MOTOR GEARING BRINELL MACHINE, MACHINE As the load or force is applied the test piece willelongate proportionally until the yield point of thesteel is reached, after which the rate of elongation ismaterially increased. The tension necessary to bring about this change inthe rate of elongation may be observed on the beam ofthe scales, and may be expressed in pounds per squareinch of the test piece. Similarly the load exerted tocause rupture, may be expressed as the ultimate tensilestrength per square inch. FOR TESTING RESISTANCE TO ABRASION, AND SCLERESCOPE b
. Electric railway journal . RAILWAY MOTOR GEARING BRINELL MACHINE, MACHINE As the load or force is applied the test piece willelongate proportionally until the yield point of thesteel is reached, after which the rate of elongation ismaterially increased. The tension necessary to bring about this change inthe rate of elongation may be observed on the beam ofthe scales, and may be expressed in pounds per squareinch of the test piece. Similarly the load exerted tocause rupture, may be expressed as the ultimate tensilestrength per square inch. FOR TESTING RESISTANCE TO ABRASION, AND SCLERESCOPE by means of the air valve, falling upon the piece undertest. The relative hardness is indicated by the heightof the rebound. This hardness is expressed in termsof a sclerescope hardness number, for example, 100for a glass-hard steel and 30 for a soft steel. There has been no commercial method devised fordetermination of relative grain structure. Microscopicanalysis has not been adapted to anything but researchwork up to the p
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