. The railroad and engineering journal . ments. These three spans are all alike in length and inall their details. The new viaduct is above the old one ; it is on a straightline, following the chord of the arc described by the oldbridge. The new structure is a deck-bridge, carrying the floor onthe upper chord ; the depths of the trusses is meters( ft.) and they are spaced meters ( fObetween centers. They rest upon two piers and upon thetwo abutments, the surface of the masonry being ( ft.) below the top of the rail. The piers and abutments are of stone in r
. The railroad and engineering journal . ments. These three spans are all alike in length and inall their details. The new viaduct is above the old one ; it is on a straightline, following the chord of the arc described by the oldbridge. The new structure is a deck-bridge, carrying the floor onthe upper chord ; the depths of the trusses is meters( ft.) and they are spaced meters ( fObetween centers. They rest upon two piers and upon thetwo abutments, the surface of the masonry being ( ft.) below the top of the rail. The piers and abutments are of stone in regular courses,with a large area at top, the surface of the masonry ex-tending I meter ( ft.) in each direction beyond theseats for the trusses ; all are built with a batter of tin 10 onall faces, and rest on a bed of beton, which is founded onthe bed-rock and extends at least a meter in every direc-tion beyond the lowest course of stone. Under these conditions, in case any movement of thepiers or abutments should take place, it wil
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectrailroa, bookyear1887
