File:The street railway review (1891) (14759608145).jpg

Identifier: streetrailway03amer (find matches)
Title: The street railway review
Year: 1891 (1890s)
Authors: American Street Railway Association Street Railway Accountants' Association of America American Railway, Mechanical, and Electrical Association
Subjects: Street-railroads
Publisher: Chicago : Street Railway Review Pub. Co
Contributing Library: Carnegie Library of Pittsburgh
Digitizing Sponsor: Lyrasis Members and Sloan Foundation

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iggingshould be designed with a large factor of safety. Themaximum pressure on the brake shoes should equal theweight of the car. The News very pertinently asks the question whetherthe interests of safety do not demand that the limitinggrade on electric car lines should be that at which the car ought to be much less than those customary at present.As an alternative, some auxiliary method may be usedto help both the brakes and the motors, such as is in useat Portland and Seattle. These, of course, mean addi-tional expense, but safety is the paramount considerationon street as on steam roads. GENETT AIR BRAKE EXHIBIT. READERS of the Review will remember a des-cription of the Genett Air Brake Companysexhibit at the Worlds Fair, which appeared inthe June issue. We present in this number an engrav-ing of the space in the Transportation Building contain-ing this interesting display. The air brake in the last six months has had wonder-ful success and its introduction has been as rapid as the
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THE GENETT AIK BRAKE, WURLDs FAIR EXHIBIT. will Stop, supposing the wheels to be locked and thewheels sliding on a greasy rail. If only wheel brakes areused it would. If a car cannot be stopped with its wheelslocked, it is not likely to be stopped at all as long as it ison the track. Frequent sweeping of the rails and sand-ing will, of course, improve the bite of the wheel on therail, and to that extent increase the brake efficiency. Experiments are cited on the Paris, Lyons & Mediter-ranean Railway, showing a coefficient of friction of .11between the wheel and rail for a railway car with wheelslocked, and sliding on a damp rail at from 18 to 20 milesper hour. According to this, an 11 per cent grade isthat at which the accelerating force would balance thefriction of the wheels on the rails at 18 to 20 miles an hour.Street railway rails are, moreover, liable to be coatedwith slimy mud, so that possibly the limiting grades most sanguine could ask. They are now in full opera-tion on

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