File:Railway master mechanic (microform) (1895) (14758556431).jpg

Identifier: railwaymastermec33newy (find matches)
Title: Railway master mechanic (microform)
Year: 1895 (1890s)
Authors:
Subjects: Railroads Railroads
Publisher: New York : (Simmons-Boardman Pub. Corp.)
Contributing Library: MIT Libraries
Digitizing Sponsor: Boston Library Consortium Member Libraries

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Text Appearing Before Image:
Ventilator Applied to Passenger Car. In order to obtain some comparison between the Cyclone andthose that were tested in 1894, by the M. C. B. Committee, oneof the type of ventilators giving the best results in that test wassubmitted to the same treatment as the Cyclone ventilator. Theresults are shown by the line B, the open circles giving the pointstaken from the actual tests. From these two diagrams it is evi-dent that the velocity of eduction through the ventilator, withwhich comparison was made, was not quite two-thirds that ofthe Cyclone ventilator, and while the Cyclone ventilator was5 in. in diameter at the neck connecting to the deck of the car,the ventilator against which it was tested was only 4 in. indiameter, and in determining the volume of eduction we haveconsidered that if a 5 in. size had been available, the velociti-swould have been the same and the quantity of air removed would N k /SOO r /400 1300 //OO
Text Appearing After Image:
Vjtloc /ty or T/rA//v //v A/f/c£& rs/t //o<//r. 510 RAILWAY MASTER MECHANIC December, 1909 be in direct proportion to the areas of the necks of the two ven-tilators. At the right hand side of the diagram are several lines, show-ing the volume in cubic feet per minute of air educted, theline C corresponding to the 5-in. Cyclone ventilator under test,and from which it is evident that at 49^4 miles per hour (whichwas the speed at which the M. C. B. Committee tests weremade, there were 210 cubic feet of air educted from the interiorof the box or car per minute. With the 4 in. ventilator, withwhich this was compared, there were 87 cu. ft. per minute eductedat 4014 miles per hour, as shown by the line D. If, however, weincrease this value by the ratio of a 5-in. circle to a 4-in. circle,we have the results shown by the line E, in which it is evidentthat the volume of eduction would be 137 cu. ft. per minute, at49J/2 miles per hour. It is evident, therefore, that the Cycloneventilato

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