File:Comparative tests of Illinois Central Railroad locomotives No. 920 and No. 940 (1909) (14757874141).jpg

Identifier: comparativetests00gibs (find matches)
Title: Comparative tests of Illinois Central Railroad locomotives No. 920 and No. 940
Year: 1909 (1900s)
Authors: Gibson, Miles Otto Lorenz, Frederick Ayres
Subjects: Illinois Central Railroad Company Locomotives Theses
Publisher:
Contributing Library: University of Illinois Urbana-Champaign
Digitizing Sponsor: University of Illinois Urbana-Champaign

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ar, so that a signal for indicator cards could be sentby the person operating the chart. Another bell on the same circuitwas placed in the cab so that simultaneous readings of steam pressurethrottle opening, and reverse lever position could be obtained. Thethrottle and reverse lever quadrants were marked so that the observ-er could read the throttle opening in inches, and the position ofthe reverse lever in notches. A scale was also provided on the boiler gage glass for reading the height of the water in the boiler. Throughout the tests all observations were directed fromTest Gar 17, all observers receiving signals simultaneously. A rec-ord of the time of taking all readings was also made on the test carchart. The steam pressure and reverse lever positions were recordedon the chart by an electro-magnet, operated from the cab by means ofa push button. The tender tanks were previously calibrated, and scaleswere painted on diagonally opposite corners of the tank, so that the Plate TZZ 15
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17 average height could be obtained. The height of the water was ob-tained by means of a hose, connected to the bottom of the tank, witha glass tube inserted in the free end. Readings were obtained by-lowering the hose until water was visible in the glass tube. Thenby placing the tube alongside of the scale on the tender, the heightcould be easily read. The water cosumed during each test was determined bynoting the height of water in the tender at the beginning and end ofeach run, and before and after taking water. By the calibration,the weight corresponding to a given height in the gage glasses wasknown. The reducing motion as shown by Plate V, needs no expla-nation. Crosby indicators were attached to each cylinder as shownon the Plate. 3/4 inch pipes, as short as possible, and having easybends were used. The pipes were wrapped with heavy cord, and an ad-ditional covering of waste was put around them during the tests.Revolution counters were placed on both sides and were actuated by

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