. The car wheel; giving the results of a series of investigations . ARRANGEMENT OF APPARATUS TO TEST THE FRICTIONAL RESISTANCE OFCAR WHEELS TO SKIDDING. The apparatus was designed to produce, as nearlyas possible, the actual conditions of track work. Two pieces of steel rails of 75 lbs. section, one ofwhich had been worn smooth in service, the other apiece of new rail, together with a section of a steelwheel and a section of a cast iron wheel, with thetreads of both smooth and free from imperfections,were used for the tests. The testing machines weremade by Tinius Olsen & Co., one with a capac
. The car wheel; giving the results of a series of investigations . ARRANGEMENT OF APPARATUS TO TEST THE FRICTIONAL RESISTANCE OFCAR WHEELS TO SKIDDING. The apparatus was designed to produce, as nearlyas possible, the actual conditions of track work. Two pieces of steel rails of 75 lbs. section, one ofwhich had been worn smooth in service, the other apiece of new rail, together with a section of a steelwheel and a section of a cast iron wheel, with thetreads of both smooth and free from imperfections,were used for the tests. The testing machines weremade by Tinius Olsen & Co., one with a capacity of100,000 lbs. and the other a capacity of 50,000 lbs. The apparatus is shown in the accompanyingillustrations for the skidding movement. The wheelsection was set on the rail and loaded by the 100,000lbs. capacity machine. It was then slipped over therail by a pull on the connection rod reaching tothe other machine which measured the amount ofthe pull required to slip the wheel on the rail. 96. PL/:iT£A/ or rssrwc M^cmvs ARRANGEMENT OF APPARATUS FOR TESTING THE FRICTIONAL RESISTANCEOF CAR WHEELS TO SPINNING. In loading the wheel, the pressure was appliedthrough a plate resting on two rollers. In this waythe friction, except that between the wheel and therail, was reduced to practically nothing. For the spinning motion, the bearing plate abovethe rollers was made convex and the bottom plateresting on the top of the wheel was made concave,both surfaces being concentric with the tread of thewheel. A pull on the wheel, therefore, caused it toroll under the bearing plate as though it were re-volving on its own center. The arrangement of thisis clearly shown in the diagram. The force required to move the wheel on the railwas weighed by a bell crank with a knife-edge bear-ing, resting on a heavy casting attached to the bed 97 plate of the small testing machine. The vertical armwas attached to the pull rod and the end of thehorizontal arm had a bearing on a wedge or knifeedge that
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Keywords: ., bookaut, bookcentury1900, bookdecade1900, booksubjectrailroadcars
