File:Locomotive engineering - a practical journal of railway motive power and rolling stock (1899) (14757840084).jpg

Identifier: locomotiveengine12hill (find matches)
Title: Locomotive engineering : a practical journal of railway motive power and rolling stock
Year: 1892 (1890s)
Authors: Hill, John A. (John Alexander), 1858-1916 Sinclair, Angus, 1841-1919
Subjects: Railroads Locomotives
Publisher: New York : A. Sinclair, J.A. Hill (etc.)
Contributing Library: Carnegie Library of Pittsburgh
Digitizing Sponsor: Lyrasis Members and Sloan Foundation

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ately, and consequently the figuresobtained were not considered entirely re-liable. Three years ago a committee ap-pointed by the Railway Master Mechanics whose readings were influenced by theway it was handled/ A variety of other engineers had madetests on the friction of slide valves, amongthem Mr. J. A. F. Aspinall, of the Lan-cashire & Yorkshire Railway, who in1889 read a paper before the Institute ofCivil Engineers, giving particulars of ex-periments made on the friction of loco-motive slide valves. At that time he wasnot entirely satisfied with the dynamo- friction diagrams were taken from thedynamometer, were of the ordinarylength, the motion being obtained by suit-able mechanism from the piston cross-head ; but in the present experiments themotion was obtained from the valvespindle crosshead, this being considereda more accurate method of ascertainingthe steam pressure at any known positionof the valve. It then became easy to ob-tain a simultaneous record giving a friction
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APP.\RATUS USED IN MEASURING THE FRICTION OF SLIDE VALVES. Association, of which Mr. G. R. Hender-son was chairman, made an exhaustiveseries of tests on the experimental loco-motive at Purdue University, and theywere aided in the work by ProfessorGoss. The results of a great many testswent to show that valves balanced 60 percent, of their area were moved with lessthan half the power required to move anunbalanced valve. There was, however,considerable doubt about the accuracy ofthe tests, for the dynamometer employedto measure the extent of resistance tovalve movement was a rather crude affair. meter employed, but he kept working atthe problem and in time perfected an ap-paratus which seems entirely reliable.With that new apparatus he made sometests on slide valves that are described ina paper recently presented to a meeting ofthe Institute of Civil Engineers. Ageneral view of the apparatus employedis shown in the annexed engraving, lentus by the American Machinist. The paper tells tha

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