File:American engineer and railroad journal (1893) (14574793388).jpg

Identifier: americanengineer77newy (find matches)
Title: American engineer and railroad journal
Year: 1893 (1890s)
Authors:
Subjects: Railroad engineering Engineering Railroads Railroad cars
Publisher: New York : M.N. Forney
Contributing Library: Carnegie Library of Pittsburgh
Digitizing Sponsor: Lyrasis Members and Sloan Foundation

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are located six of the new type of Gen-eral Electric series transformers delivering constant-currentat 6.6 amperes, for the series-alternating arc light circuits.Each transformer has a capacity of 50 arc lights, operatedin two circuits of 25 each, and is insulated with oil. Thetotal capacity of the transformers, 300 lights, will be distrib-uted for lighting the yards of the entire properties of thecompany at Reading. The distribution circuits are all led out from the switch-boards underground through lead-covered cables, either tothe shops or to the outlet to the overhead lines. An impor-tant feature of the distribution system is that, whereverlocated throughout the shops, all low-voltage wires are carriedupon porcelain and the high-voltage wires upon glass insula-tors well up out of the way. This informs the workman at aglance which wires are to be avoided for safety. Mean Effective Pressure and Diameter of Wheels200 190 )80 170 lliO l.W llO 130 120 110 100 90 80 70 00 .50 40 m 20 10
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30 o, , 32 Stroke A TKAcnVE POWER CHART.—BY L. L. BENTLEY.Note.—The dotted Hues show the method applied to the 2-8-0 C R. I. & P. locomotive (American Engineer, March, 1903, page106). Cylinders 22 by 30 ins., driviug wheels 63 ins., steam pressure 200 lbs. June, 1903. AMERICAN ENGINEER AND RAILROAD JOURNAL. 239 CHART FOR TRACTIVE POWER OF LOCOMOTIVES. AMERICAN ENGINEER TESTS. Locomotive Dbajt Applia.nxes. While the general principle on whicli this diagram is con-structed is not new, its convenience is such that it is hopedit may be of interest. In order that it may be reproduced adescription of the construction is given. Taking the usual formula for the tractive power of a simpleengine pd^s T.P. — Dwhere T.P. = tractive power p = mean effective pressure = a constant X boiler pressure,d = diameter of cylinder in inches,s =: stroke in inches, D^ diameter of driving wheels in inches,we can write it in the form of a proportion T.P. a= s ^ P D which can be expressed graphically b

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