File:The Street railway journal (1899) (14572532657).jpg

Identifier: streetrailwayjo151899newy (find matches)
Title: The Street railway journal
Year: 1884 (1880s)
Authors:
Subjects: Street-railroads Electric railroads Transportation
Publisher: New York : McGraw Pub. Co.
Contributing Library: Smithsonian Libraries
Digitizing Sponsor: Smithsonian Libraries

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air resistance. 294 STREET RAILWAY JOURNAL. (Vol. XV. No. 5. the working of the compound system at different speeds,admissions in high and low pressure cylinders and thework performed. He plotted a series of curves showingthe total amount of indicated power developed by the loco-motive in hauling trains at various speeds and ratios ofadmission in the two cylinders. All these curves were re-duced to the case of moving on a level and with no accel-eration. Deducing the power required for hauling thetrain, he found curves showing the power required formoving the locomotive and tender alone, for the case of alevel track and no acceleration. I have plotted these curves in Fig. 3. The heavy lineshere correspond to the case of an admission of 0.7, and thelight lines to admissions of 0.4-0.5,in the low pressure cy-linders. Numbers 0.2, 0.3, 0.4, 0.5 on both series of curvesshow ratios of admission, viz.: 0.2, 0.3, 0.4 and 0.5 in thehigh pressure cylinders. It is easy to see that the ratio of
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80 90 100 110 120 Street Railway Journal,IV. P. 30 40 50 on 70 KM. PER HOUR FIG. 2.—GROUP OF CURVES FOR RESISTANCE OFLOCOMOTIVES (WITH TENDER) AND FOR CARS ONLY. Upper curves /or locomotive and tender only. Nos. 1 and 2.—De^douit (French State Railways). L = 55. No. 3 P.—Maximum resistance deduced from M. Privats experiments (French P. L. M.Ry). L = 84.2. No. 3 S.—Minimum resistance deduced from M. Privats experiments (French P. L. M. Ry), L = 84.2.No. 4 —Barhier (French Northern Ry.) L = 93.5.Nos 5 and 6.—Gen. Petroff.Lower curves for cars only. No. 1.—Desdouit (French State Railways) Q = 75, n = 8.No. 2.— Q = 75, n = 3. No. 3.—Barbier (French Northern Ry.) (J = 200, n = 15.No. 4.— • ■ Q = 296, n = 7. No. 5.—French Western Ry. No. 6. —French Northern Ry., from Gen. Petroffs formula, Q = 206, n = 15.No. 7.— Q=206, n= 7. No. 8.—Canadian Pacific 11 u 14 Q — 152. n = 5. No. 9.—Pennsylvania Ry , * * 11 41 Q = 162, n = 5. No. 10. —Russian Railway, Q =

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