File:The street railway review (1891) (14738598986).jpg

Identifier: streetrailwayrev14amer (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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s. .\ny member subject to tensile strainwas paralleled with l-in. wrought iron rods. The erection of thehigh framing over the water was greatly facilitated by making useof a pile driver and its rigging. All lumber used throughout the bridge and run over cast-iron sheaves on top of the Irame to thecounter-weights. The lower cables seen in the illustration are ^^-in.flexible plow steel hauling lines, snubbed to the top of the frame andrun over single blocks, fastened to the end of bridge, thence backover a snatch block in top of the truss, and down to drums of thehoisting engine in the operators house. The hoisting engine is of the I.idgerwood Manufacturing Cos.make with two 24-in. drums, fitted with friction hand lever and fric-tion foot lever brakes, and is directly connected to a series motor.The foot lever brakes were connected so that both drums could beoperated simultaneously in the process of lowering the bridge. Thehoisting engine was one found in stock without the motor attach-
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FIC. 3—BENTS I, 2. 3, 4, 5. 6, 7, 8. KIC. 4—llENTS 15. 16,INK 17, 18, .SUPPORTINC, H0I.ST-FR.VME. FlC. 5—BENTS (J. 10, II,—.ABUTMENT. work was Southern long leaf yellow pini-. iliere being 20.000 ft.board measure in the hoisting frame alone. Fig. 5 shows the draw 11 days before the entire bridge was inservice. The four curves or runs, two on each side of the hoistingframe, were re-enforced by spiking along their top surface fourJ4-ii. 6o-lb. T-rails. The T-rails also formed guides for the counter-weights. merit. .\n old street-car motor was placed and connected to thehoist at the companys repair shops. The first time the bridge wasraised the hauling line on one side became slack through failure ofa temporary snatch block to operate perfectly However, the bridgewas so evenly balanced by the countcr-weiglus that there was nodifficulty met with in raising or lowering with a single drum andsingle line. Sept. 20. 1904) STREKT RAinXAY REVIEW. 583 Several schemes wcri- propo.^od for

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