. The street railway review . FIG. 10—PI,.\TE CROSS GIRDER CONSTRCCTIOX. with a passage for vessels on each side 50 ft. wide. The drawis 100 ft. wide and 23 ft. above mean high water. The indi-vidual trusses, of which there are four, are 24 ft. deep at the endand 43 ft. at the highest point of the center. The bridge provides 124 STREET RAILWAY REVIEW. [Vol. X, No. 3. for a double line of surface car tracks, two roadways 29 ft. wide forvehicle traffic and two side paths to ft. wide for pedestrians. Therevolving mechanism is contained in the circular base which is 54ft. in diameter and the load
. The street railway review . FIG. 10—PI,.\TE CROSS GIRDER CONSTRCCTIOX. with a passage for vessels on each side 50 ft. wide. The drawis 100 ft. wide and 23 ft. above mean high water. The indi-vidual trusses, of which there are four, are 24 ft. deep at the endand 43 ft. at the highest point of the center. The bridge provides 124 STREET RAILWAY REVIEW. [Vol. X, No. 3. for a double line of surface car tracks, two roadways 29 ft. wide forvehicle traffic and two side paths to ft. wide for pedestrians. Therevolving mechanism is contained in the circular base which is 54ft. in diameter and the load is supported on solid steel wheels whichare placed very close together. Two electric motors, mounted on niannor as that described for the Charlestown Station. Fig. 17 is across section of the elevated station on .Atlantic .\ve. at the SouthUnion or Terminal Depot, showing the approaches; it is notedthat on one side a bridge leads from the elevated station throughthe side wall of the passenger FIG. 1: EKECTING l-IG. EKECTIXGSTKUCTURE. brackets, on either side of the base, provide the power for operatingthe draw and are connected by suitable shafts and reducing gear toa spur wheel which meshes into a gear extending entirely aroundthe base. Suitable hydraulic lifts at the ends of the structure serveto lock and help support the ends of the draw when closed. The surface construction of the elevated structure is illustrated inFig. 15 and shows the location of the track and conductor conductor rail is partially housed and guarded by means of twoplank stringers which are supported by iron brackets spiked to thecross ties. The conductor rail will probably be mounted on insulat-ing blocks. All of the rails, including the conductor rails, are to beof the A. S. C. E. standard section weighing 85 lb. per yd., and thetrack rails are connected by Continuous joints. The rails arelaid on tie plates. All timber work shown -in the llustration is cflong leaf so
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Keywords: ., book, bookcentury1800, bookdecade1890, booksubjectstreetrailroads
