File:Railroad construction - theory and practice - a textbook for the use of students in colleges and technical schools (1908) (14572327537).jpg

Identifier: railroadconstruc01webb (find matches)
Title: Railroad construction : theory and practice : a textbook for the use of students in colleges and technical schools
Year: 1908 (1900s)
Authors: Webb, Walter Loring, 1863-1941
Subjects: Railroads
Publisher: New York : J. Wiley
Contributing Library: The Library of Congress
Digitizing Sponsor: The Library of Congress

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(6.t) =777; .\x = lm\i.e., MN drops, parallel to itself, 1/n as much as the wheeldrops, where n is the number of wheels. The resultant effectcaused by the simultaneous motion of U\o wheels with refer- 1L
Text Appearing After Image:
7n^~~cv Fig. 195.—Action of Equalizing-levers. ence to the third is evidently the algebraic sum of the effectsof each wheel taken separately. The practical benefits of this device are therefore as follows: (a) When any driver reaches a rough place in the track, ahigh place or a low place, the stress in all the various hangersand levers is unchanged. (6) The motion of the frame (represented by the bar MNin Fig. 195) is but 1/n of the motion of the wheel, and the jarand vibration caused b)^ a roughness in the track is correspond-ingly reduced. The details of applying these principles are varied, but ingeneral it is done as follows; (a) American and ten-wheeled types. Drivers on each sideform a system. The center-bearing pilot-truck is the thirdpoint of support. The method is illustrated in Fig. 196. (b) Mogul and consolidation types. The front pair of driversis connected with the two-wheeled pilot-truck (as illustratedin Fig. 197) to form one system. The remaining drivers oneach side

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