. The Canadian journal ; a repertory of industry, science, and art ; and a record of the proceedings of the Canadian Institute. PORTABLE LIFTING MACHINE. S? Annexed is a summaiy of the cast and wrought iron used in the bridge:â Tons. cwte. qrs. Wrouglit iron, in tli'ee spans of 100 feet eacli, double line 277 0 0 Wrought iron in the girders, floor-bearers, and other work of the main span of 300 feet, double line - - Two wrought iron tubes, each 312 feet long - - â Wrought iron beam on the standard to support the tubes Vertical trusses â¢â¢â¢...-â¢. 37 0 Tie girders to connect the ca
. The Canadian journal ; a repertory of industry, science, and art ; and a record of the proceedings of the Canadian Institute. PORTABLE LIFTING MACHINE. S? Annexed is a summaiy of the cast and wrought iron used in the bridge:â Tons. cwte. qrs. Wrouglit iron, in tli'ee spans of 100 feet eacli, double line 277 0 0 Wrought iron in the girders, floor-bearers, and other work of the main span of 300 feet, double line - - Two wrought iron tubes, each 312 feet long - - â Wrought iron beam on the standard to support the tubes Vertical trusses â¢â¢â¢...-â¢. 37 0 Tie girders to connect the caps of columns - - - Saspending links in main chains and diagonals ⢠Saddles at points of suspension rollers - - - - Adjusting screws â¢â¢..... Eollers of main tube ......... Rollers of girders â¢. BolU 278 6 1 302 U 0 20 S 0 37 U 1 1 10 0 256 5 2 41 10 1 2 10 0 7 17 3 2 11 3 3 15 0 Total wrought iron â¢â¢ 1831 22 Tons. cwtB. qra. Cast iron bed-plates for trusses 24 61 standard 128 60 â¢' caps for columns and parapets ..... 21 00 " cylinders in the supporting 830 0 0 Total cast iron 1003 12 1 To;is. cwts. qrs. Wrought iron 1231 2 3 > gg,, ,, , Cast iron 1003 12 1 I ^â¢^â¢** '* * Masonry in abutment and pier, 3240 cubic yards. Total estimated cost of the Bridge when entirely completed, £65,420. The Bridge has been visited by a great number of engineers from the Continent and the East Indies; indeed, it is only by a personal inspection that the numerous ingenious arrangements can be understood. The whole seems, when finished, to be very simple; yet engineers will fully enter into the complexity of the design, and the minute and carefully propoi'tioned scantlings given to every part. We would specially call their attention to the cast-iron ring or circle attached to the ends of the tube to prevent collapse; to the wedges introduced undei the vertical trusses to adjust the exact tension upon the chain; to the cur
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Keywords: ., bookauthorcanadian, bookcentury1800, bookdecade1850, bookyear1852
