. The car wheel; giving the results of a series of investigations . geadded to the strength, but even in individual wheelsthus reinforced there is a variation from 68,200 105,900 lbs. in the breaking strength. These tests cover practically all that is known ofthe strength of the cast iron wheel to resist thethrust on the rail. In order to ascertain approxi-mately the relative strength of the steel wheel undersimilar conditions a Schoen wheel was tested inthe same way. The work was done under a power-ful hydraulic press and the flange broke ofi^ under aload of 526,612 lbs. This was more
. The car wheel; giving the results of a series of investigations . geadded to the strength, but even in individual wheelsthus reinforced there is a variation from 68,200 105,900 lbs. in the breaking strength. These tests cover practically all that is known ofthe strength of the cast iron wheel to resist thethrust on the rail. In order to ascertain approxi-mately the relative strength of the steel wheel undersimilar conditions a Schoen wheel was tested inthe same way. The work was done under a power-ful hydraulic press and the flange broke ofi^ under aload of 526,612 lbs. This was more than timesthe load required to break the strongest part of thereinforced flange and more than 11 times the load re-quired to break the weakest of the standard flanges. The ratio of to i corresponds fairly closelywith the ratio of the tensile strength of the twometals. It has been seen that the tensile strengthof the steel of the Schoen wheel is about 124,000lbs. In some tests of cast iron that have been madeit was found that samples of gray iron made from. TRACK APPARATUS FOR ASCERTAINING WHEEL AND RAIL PRESSURES. first-class wheel mixtures broke at from 16,000 17,000 lbs, while test specimens, carefully groundfrom the white chilled iron of a car wheel, brokeunder loads as high as 36,000 lbs. The lack of any data on the stresses to whichwheels are subjected in service, other than thatbased on theoretical calculations, necessitated thecarrying out of a series of investigations whichwould throw some light on the subject from a practi-cal standpoint. The object was to determine thelateral thrust to which the wheels under high capac-ity freight cars may be subjected when moving overcurves at different speeds, and, if possible, to developthe law in accordance with which the thrust in-creases as the speed of the car is increased. As an investigation of this kind had never beforebeen undertaken, it was necessary to design andbuild a special piece of apparatus. The devic
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Keywords: ., bookaut, bookcentury1900, bookdecade1900, booksubjectrailroadcars
