. Railway mechanical engineer . ed to drivethe mechanism are turned to a definite circumference and arewithout brakes for the purpose of eliminating the wear due tothe brake shoe friction. A wear of Y% in. on the radius is per-missible, the wheels having 3/16 in. excess radius when new tomaintain maximum average accuracy in service. DYNAMOMETER The dynamometer itself is of special interest due to the largecapacity combined with the exceptionally small space it occupiesin the car and the compactness of the whole arrangement. Itis a new design of the diaphragm type. The coupler is rigidlyconnect
. Railway mechanical engineer . ed to drivethe mechanism are turned to a definite circumference and arewithout brakes for the purpose of eliminating the wear due tothe brake shoe friction. A wear of Y% in. on the radius is per-missible, the wheels having 3/16 in. excess radius when new tomaintain maximum average accuracy in service. DYNAMOMETER The dynamometer itself is of special interest due to the largecapacity combined with the exceptionally small space it occupiesin the car and the compactness of the whole arrangement. Itis a new design of the diaphragm type. The coupler is rigidlyconnected to the bottom of the dynamometer lever, the connec-tion being about 3 ft. back of the end sill. The dynamometerlever itself is pivoted on a 5^4-in. pin, which bears on six hard-ened steel pins inserted in the bearings to reduce the friction. dynamometer lever is provided with knife edges, which bear onpistons on either side of the lever for recording the buffing andpulling forces. Both the pistons are suspended on knife edge. Dynamometer and Drawbar hangers and float in the cylinders, there being a clearance of1/64-in. between the pistons and the cylinder walls. The buffingpiston has about 160 sq. in. of surface and is designed for 2,000
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectrailroadengineering
