The Act of incorporation (23d Vic., cap13) and the by-laws, adopted 11th January, 1864 . not to be injured by the expansion or thecontraction of the tubes. The sides of that portion of the top of the piers onwhich the tubes do not rest, are covered with iron brack-ets, which protect the masonry of the pier, and also pre-vent snow from blowing in through the space left for theexpansion of the tubes. The tubes themselves were constructed in position, andthe difficult and expensive process of floating them fromthe shore and lifting them by hydraulic pressure was thusdispensed with. Where the coff
The Act of incorporation (23d Vic., cap13) and the by-laws, adopted 11th January, 1864 . not to be injured by the expansion or thecontraction of the tubes. The sides of that portion of the top of the piers onwhich the tubes do not rest, are covered with iron brack-ets, which protect the masonry of the pier, and also pre-vent snow from blowing in through the space left for theexpansion of the tubes. The tubes themselves were constructed in position, andthe difficult and expensive process of floating them fromthe shore and lifting them by hydraulic pressure was thusdispensed with. Where the coffer-dams were in use, theframing was carried up from them; and in the centre, a scowwas anchored and piles driven in around it, on which thescaffolding rested. It was here that the difference betweenthe two systems of dams was apparent. In the one threescows secured with piles was necessary; in the other, butone. On these supports a truss was formed on which the,tube was-put together. THE VICTORIA BRIDGE. 53 The following wood-cut shows the description of trussused for this purpose :. The Expansion Rollers are seven in number in each set,of 6 in. diameter, in a cast-iron frame, rolling on planedbed-plates. The rollers themselves being turned and the bedsplated, they run as smoothly as on glass. Riveting. The rivets are an inch in diameter, and are arranged inrows. They were heated in portable furnaces, which weremoved from place to place as the work proceeded. Fromthese forges the rivets were taken up with tongs by one ofthe boys attending and thrown to the rivetters on the stageabove ; and it was extraordinary to remark with what dex-terity and precision these lads would throw the rivets andmake them curve over the stage and fall to right or to left onany spot they desired. The rivets were then placed in the 54 hunters hand book of holes punched for them, and the ends firmly clenched withheavy hammers before cooling. The rivet head, thus formed, is in a rough shape, and isfinis
Size: 1710px × 1461px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., boo, bookcentury1800, bookdecade1860, booksubjectart, bookyear1864
