ecific gravity of themetals at different points below the tread. Chemi-cal analyses were made from samples of each tireand wheel taken from a point below the center ofthe tread. Finally, a series of microphotographswere taken of etched specimens of the metals inorder to show their structure and the… … LOCATION OF TENSILE TEST SPECIMENS. made in the usual manner, using test pieces 2 incheslong between marks. The reason for choosing thislength was that the curvature of the treads of thewheels and tires made it impossible to cut longerones. These specimens were cut from the points C,D, and E, as…
Railroad cars
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