Identifier: steamroadtestswi00jaqu (find matches)
Title: Steam road tests with railway test car 17 for the year 1907-1908
Year: 1908 (1900s)
Authors: Jaquet, George Emile Munger, Guy Elmer
Subjects: Railroad cars Dynamometer Theses Theses
Publisher:
Contributing Library: University of Illinois Urbana-Champaign
Digitizing Sponsor: University of Illinois Urbana-Champaign

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the cam was laid out hy experiment.A prick point v;as first inserted in place of the cam roller.The recorder was then run at a number of knovm speeds,throughoutthe desired range of the cam. The points were located hy setting position the rod e at the desired^for the given speed and thentapping 9£the blank cam plate against the prick point. Time Pen. The magnet, which operates the time pen, is sho?m in Pig. IS.Lever A, which moves the pen rod, is held against the cam wheel Bby a spring. When the circuit thru the coil is closed at the endof every five secondsjthe magnet draws lever C down, thus movingthe cam wheel forward one notch of the attached ratchet wheel.There are twelve times as many teeth in the ratchet wheel as thenuraber of cams, so that after every twelve progressive offsets,the recording pen drops back to zero and starts the operation overagain* This gives a large offset in the time line at the end ofevery minute, which facilitates the work of calculation on thechart. -28
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Mile Post Record* The mile post pen is operated by a simple magnet connectedto the pen rod. The circuit thru the magnet is closed hy meansof a push hutton whenever a mile post or station is passed. Thenumber of mile posts and names of stations are noted on the chartto aid in calculating the results. Draw - Bar Horse Power Recorder. The horse-power recording instrument is a device for auto-matically multiplying the draw-har pull and speed, thus giving acontinuous record of the horse-power heing delivered at the testcar draw-*bar. Lever G (?ig. 16) is connected to a rod operatedby one of the speed recorders and moves lever D E distancesproportional to the changes in speed. Lever H is connected toone of the draw-har pull indicators and moves DA distances propor-tional to draw-bar pull (C is free to slide along EA.) The theoryof the instrument is as follows:

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