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Image from page 245 of “The Street railway journal” (1884)
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Identifier: streetrailwayjo181901newy
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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rters are used. Direct-Current Railway Motors.—The characteristics of thistype of motor are so well known that it is not worth while to dis-cuss them further than to say that in general the tendency seemsto have been during the last few years to design the motors fora given train weight and maximum speed, disregarding the num-ber of stops, provided the car is accelerated and retarded at acomfortable rate, which involves, of course, the schedule speedchanging with the number of stops. To accomplish this, the motors are so designed and particularlythe ventilating conditions are such that the temperature of thefields will not rise more than a safe number of degrees if sub-jected to the accelerating current at the rate of, say, ten timesper mile, and the armature has such a low core loss that it canrun for a considerable time at the maximum speed. Such con-dition is made possible with the modern mechanical design whichreadily conducts the heat from the inside to the outside, and 1200 30
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thereby obviates great differences in temperature. The maindifference in electrical design is that much more precaution hasto be taken to have low self-induction in commutation. This isnecessary since, as stated above, the field winding has to stand thefull current of acceleration for a much longer time than formerlywas the practice, and, therefore, a less number of turns and aweaker field in general is used in modern motors, this conditioncausing sparking unless the armature reaction is reduced and thenumber of commutator segments increased. We therefore findnow, as a rule, higher flux and a greater number of commutatorsegments than in older types of motors. Alternating-Current Railway Motors.—A very superficial studywill show that, whenever this type of motor has been adopted, thereason lies, not with the motors themselves, but in the fact thata lesser amount of feeder copper, and possibly fewer attendants,are required with an alternating-current railway system than witha direct-c
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Image from page 126 of “The Scientific American reference book; a compendium of useful information for inventors and mechanics, containing the complete patent laws of the United States … forms for patents, caveats, assignments, licenses, and shop rights
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Identifier: scientificameric02newy
Title: The Scientific American reference book; a compendium of useful information for inventors and mechanics, containing the complete patent laws of the United States … forms for patents, caveats, assignments, licenses, and shop rights … etc., etc
Year: 1876 (1870s)
Authors:
Subjects: Patents
Publisher: New York, Munn
Contributing Library: The Library of Congress
Digitizing Sponsor: The Library of Congress
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y multiplyingtogether the area of the piston in inches, the mean pressurein pounds per square inch, the length of the stroke in feet,and the number of strokes per minute; and dividing by33,000. Water-wheels yield from 50 to 91 per cent of the water.The actual power of a steam-engine is less than the indicat-ed power, owing to a loss from friction; the amount, of thisloss varies with the arrangement of the engine and the per-fection of the workmanship. HEAT-CONDUCTING POWER OF BODIES. 123 ZUB BEACHTUNG FUR DEUTSCHE ER-i FIN DEB. S)ie llnterjet(^neten ^abm eincStnteiticiig t>erau§gcgebcn, it^elcjjcangiebt h)a8 ju befolgen ift urn einpatent j^u ftd;ern, unb felbige tinrbauf :|)ortofreie 5Infrage gratis abge*geben. 9^od^ bent iteucn ^atent>©efe^etoiinen SSiirger otter 2anbtx ^45a=.tente in ben SJerettitgten ©toateitgu benfelben SSebingungen erlcn^gen, tnie bie SSiirger bcr ^ereinig*ten ©taoten jelbft. 5Pttttttt 8^ ^o.. Ho. 37 |)arK Horo^ lleni-l)ork.Scientific American Office.
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A MOVING load has a much greater effect on a beam thana load at rest. For example, if the breaking weight of abeam is 4150 pounds, the load being at rest, a load of 1778pounds, moved at 30 miles per hour, will break the samebeam. The deflection of girders increases with the velocityof the load. HEAT-COIyrDUCTING PO^WER OF DIFFER-ENT BODIES. Gold, 1000 Platinum, 981 Silver, 9T3 Copper, 898 Tron, 374 Zinc, 363 Tin, 304 Lead, 180 Marble, 24 Porcelain, 12 Fire Clay, 11 Fire Brick, 11 RELATIVE CONDUCTING PO^WER OFFLUIDS. Mercury, 1000 I Proof Spirit, 312 Water 35T | Alcohol, (pure,) 232
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Image from page 1487 of “Hardware merchandising March-June 1919” (1919)
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Identifier: hardmerchmarjun1919toro
Title: Hardware merchandising March-June 1919
Year: 1919 (1910s)
Authors:
Subjects: Hardware industry Hardware Implements, utensils, etc Building
Publisher: Toronto :
Contributing Library: Fisher – University of Toronto
Digitizing Sponsor: Algoma University, Trent University, Lakehead University, Laurentian University, Nipissing University, Ryerson University and University of Toronto Libraries
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and Stallion Chains, Wall Plugs,Wall and Veneer Ties, Sash Pulleys, Sash Chains, etc. Streetand other Signs, Checks, Badges, Medals, Dog Tags, LicensePlates, Name Plates, Miscellaneous Goods. SPECIAL BARGAINS IN TRAPS FOR 30 DAYS.Catalog No. 25 on request. Niagara Falls Metal Stamping Works Niagara Falls, N.Y. Kills the Losses Why should housewives take ALL the risk in regard tohonest mistakes in weighing. It certainly is easy to con-vince her she shouldnt, and that a Renfrew scale willsave not only risk, but many actual losses. That buildsup sales for YOU. An ordinary, doubtful scale would only add uselessdisputes. The Renfrew is accurate for every weight fromV2 oz. to 30 lbs., and its owner can prove her weightsevery time by means of the Government Inspectors Cer-tificate which goes with every Renfrew. The Renfrew is made in black finish, or in all-nickelfinish suitable for candy stores or homes desiring a littlebit better. Write for literature and attractive selling 8 proposition.
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Renfrew HOUSEHOLDSCALE Guaranteed to weigh accurately. Capacity: J4 oz. to 30 lbs. The Renfrew Scale Co. Head Office and Works, Renfrew, Ont. Western Representatives: P. A. C. Mclntyre & Co., 810 Con-federation Life Bldg., Winnipeg, Man. Our Other Lines: Renfrew 2,000-lb. Farmers Truck Scale. REEDS SPECIAL >sis fiPSBJ
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