. Annual report of the Metropolitan Water and Sewerage Board. in Clinton on Section 3 of the railroad. The viaducthas a length of 921 feet between end pins, and a height above thelowest part of the valley of 133 feet. The two bridges over high-ways have spans of 30 and 43 feet, respectively. The bridges are allof plate-girder construction. The spans for the viaduct between thetowers are 72 feet, and across the eight towers 38 feet. The spansto the abutments at the easterly and westerly ends are GO and 53feet, respectively. At the beginning of the year one of the smallbridges had been completed
. Annual report of the Metropolitan Water and Sewerage Board. in Clinton on Section 3 of the railroad. The viaducthas a length of 921 feet between end pins, and a height above thelowest part of the valley of 133 feet. The two bridges over high-ways have spans of 30 and 43 feet, respectively. The bridges are allof plate-girder construction. The spans for the viaduct between thetowers are 72 feet, and across the eight towers 38 feet. The spansto the abutments at the easterly and westerly ends are GO and 53feet, respectively. At the beginning of the year one of the smallbridges had been completed at the works, but had not been of the remaining material had been rolled, and the shop workon the viaduct had been begun. During the week ending February 7 the first steel for the viaductwas received. All the material for that part of the viaduct in thebottom of the valley and on the westerly slope was unloaded fromthe cars and transported to the bottom of the valley by the cable-ways, and moved to the site of the viaduct by cars running on a. No. 57.] AND SEWERAGE BOARD. 107 short track. The material for the part on the easterly slope wasdelivered by teams on Boylston Street. The first steel was placedduring the week ending March 7 ; all the steel was in place onMay 29, and the riveting was completed on June 20. The first trainpassed over the viaduct on June 8, and trains began running regularlyon June 15. To erect the towers for the viaduct a very large derrick was set upon the ground or on timber cribbing near each tower, and the posts,which for the higher towers were in three sections, were usuallybolted together and raised as one piece, each post as raised beingsecured by guy ropes until the remaining posts of the tower and thebracing were in place. To raise the spans a traveller, which wasessentially a derrick with two booms, one 67 feet long and the other57 feet long, was used. This was fastened by means of heavy boltsto the girders already in place, and wa
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectwatersupply, bookyear
