. American engineer and railroad journal . on of the pen could be made to beeither 1,000, 2,000, 3,000, 4,000, 5,000, 6,000, 7,000, 8,000 or10,000 lbs. After considering several different systems for the dynamo-meter it was finally decided to use the hydraulic principle inwhich all of the load on the drawbar should be transmitted di-rectly to the piston of a large hydraulic cylinder secured to theframe of the car. The pressure exerted by this piston on thefluid in the cylinder to be carried to the piston of a small re-cording cylinder, the movement of which is restricted by anumber of carefull
. American engineer and railroad journal . on of the pen could be made to beeither 1,000, 2,000, 3,000, 4,000, 5,000, 6,000, 7,000, 8,000 or10,000 lbs. After considering several different systems for the dynamo-meter it was finally decided to use the hydraulic principle inwhich all of the load on the drawbar should be transmitted di-rectly to the piston of a large hydraulic cylinder secured to theframe of the car. The pressure exerted by this piston on thefluid in the cylinder to be carried to the piston of a small re-cording cylinder, the movement of which is restricted by anumber of carefully calibrated helical springs. The strength ofeach set of springs will determine the amount of movementof the recording pen secured to the end of the piston rod of thesmall cylinder, for any pressure exerted on the large hydrauliccylinder or main press. Thus by knowing the relative areas ofthe two pistons and the amount that the springs will compress iS ifl ..... r ^^^MffMn^BiW Wi, 1, _ ,,. ,,, ,———~—, )wgtw^pp«^pa&=^ -- -. ■*- DYNAMOMETER CAR—PENNSYLVANIA RAILROAD. Railroad has constructed, the earlier three of which were simpleand crude affairs compared to the later cars. The fourth car,built in 1885, had a capacity of 28,000 lbs., and has been themeans of obtaining a vast amount of very valuable informationduring its 22 years service. It, however, is altogether too lightfor modern trains, and the later car has been given a capacity of100,000 lbs. The dynamometer complete, with all its attachments, was de-signed, built and will be patented by Mr. A. H. Emery, of Stam-ford, Conn., who also constructed the dynamometer used in theformer car. The car body complete, as well as the paper drivingmechanism and other recording apparatus outside of the dyna-mometer, was designed and built at Altoona. The specifications under a certain load, the load on the drawbar corresponding tothe movement of the recording pen can easily be determined. Taking up first t
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectrailroadengineering
