. Electric railway journal . MAKING TESTS ON SAMPLES OP MATERIALS Pig. 11—Left—A Patigue Test on a Specimen ofMetal. Fig. 12—Center—Measuring the Tensile Strengthof Wire. Pig. 13—Right—Measuring the Coefficient of Ex-pansion of a Test OWING to the severe operating conditions thatrailway motors must withstand in service, it isessential that all materials should have a largefactor of safety, that they should be of uniform textureand strength and free from flaws and defects. Other-wise failures and breakdowns in service may occur, pos-sibly causing serious accident and congestion of traff
. Electric railway journal . MAKING TESTS ON SAMPLES OP MATERIALS Pig. 11—Left—A Patigue Test on a Specimen ofMetal. Fig. 12—Center—Measuring the Tensile Strengthof Wire. Pig. 13—Right—Measuring the Coefficient of Ex-pansion of a Test OWING to the severe operating conditions thatrailway motors must withstand in service, it isessential that all materials should have a largefactor of safety, that they should be of uniform textureand strength and free from flaws and defects. Other-wise failures and breakdowns in service may occur, pos-sibly causing serious accident and congestion of traffic. In order to insure a reliable supply of raw materialsto fulfill the above conditions, in the works of thiscompany, materials are covered by a P. D. (purchas-ing department) specification or an M (material)number, setting forth the requisite physical propertiesthat materials must have in order to meet the desiredrequirements, as a guide to the inspection departmentin the acceptance of this material. To a very largeextent, the percentage of material subjected to a rigidinspection and test is governed by common sense, pastexperience, source of supply and amount of trouble re-ported by the shop. To give every piece of raw ma-terial a
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