File:The street railway review (1891) (14779848853).jpg

Identifier: streetrailwayrev07amer (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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t ofthe platform and drawn into place, the truck run back andconnected ready to start. The time required was 2J4 min-utes. The unloading was accomplished in 3,^ of a minute and the commutator cleaned. The brushes are in duplicateand those not in use are put in a case each compartmenthaving the number of the motor upon it. In this way thesame brushes are returned to the same commutators and lit-tle trouble is e.\perienced from sparking. One time the brushes are soaked for one hour in liquidvaseline and the next time in parafKne, heated to the melt-ing pohit. The vaseline is the better lubricant but its lowmelting temperature sometimes causes the brushes to rundry when an excessive current lieats them. Tlie paraffinewax is not so liable to cause such trouble. Some inspectors and electricians are disposed to send thearmatures into the shop and have the commutators turneddown too often. Especially is tliis undesirable with someof the older styles of commutators as there is little depth to
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STREET CAR FOR FIRE LNOLNE—blKlNOUhLU, MASS. and the horses attached and the engine ready to start in y^minute more. We are indebted to the \V ason Manufacturing Companyfor the illujtrations. CARE OF COMMUTATORS. To get a smooth, shiney dark brown commutator on eachmotor Is the aim of every street railway electrician. Inmany cases this seems almost impossible and is doubtlessdue to the inherent defects in the design of the motor.Again, poor carbon brushes, which wear unevenly willcause bad commutators. When the apparatus is of somestandard make and all the parts are thoroughly reliablesome other cause must be sought for. If the brushes areheld in place with the proper tension the source of troul)leis probably the lubrication of the commutator. Some lubri-cants will carboni/e and form a tough gummy covering onparts of the commutator and such lubricants should beavoided. At the car barns of the Calumet lilectric Rail-way the brushes of each motor are removed every night the bars and a

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