. The car wheel; giving the results of a series of investigations . lass and brand. They will be desig-nated as Tires A, B, C and D, Wheels E and F andSchoen Wheel. Tests were made of the tensile strength, includingthe limit of elasticity, per cent, of elongation, and thereduction of area at the point of fracture. The steelswere tested for hardness by a drop of the Mattel tests were made in order to find the resist-ance of the several materials to grinding at variouspoints below the tread. Specimens were also cutfor the determination of the specific gravity of themetals at diffe
. The car wheel; giving the results of a series of investigations . lass and brand. They will be desig-nated as Tires A, B, C and D, Wheels E and F andSchoen Wheel. Tests were made of the tensile strength, includingthe limit of elasticity, per cent, of elongation, and thereduction of area at the point of fracture. The steelswere tested for hardness by a drop of the Mattel tests were made in order to find the resist-ance of the several materials to grinding at variouspoints below the tread. Specimens were also cutfor the determination of the specific 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 relation of thatstructure to the physical and chemical propertiespreviously determined independently. The chemical analyses for carbon were all madeby the combustion process and the tensile tests were 15. 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 indicated on the diagram showingthe location of tensile test specimens. These testpieces were cut on a chord of the tire and gave anavailable length of 2 inches on the reduced area |inch in diameter, the center of which was carefullylocated at the point indicated on the drawing. Thetensile tests were made in an Olsen testing machineof 100,000 lbs. capacity, and the results obtained aregiven in detail in the following table marked Com-parative Tests of Steel Wheels and Tires. The averages of these are collected and pre-sented in a condensed form in the table marked 16 wco wuo MOO MdO WOO HOO woo re Uia - - o P 2. = =^ ► - p -
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Keywords: ., bookaut, bookcentury1900, bookdecade1900, booksubjectrailroadcars
