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Leather's Suspension Aqueduct over the Calder.
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This model and unique mode of construction wasadopted in order to preserve the whole width of thewaterway of the river free and uninterrupted by piers,which was important.
The tank or trough is 9 feet deep, and 24 feet widewithin, and it contains between the points where it restsupon the abutments, 940 tons of water, more than is con-tained in the whole 19 arches of the celebrated Pont-y-Cysyllte aqueduct in Wales .
There is a towing-path on each side, which projectspartly over the water within, and partly on the outer sideof the trough. By the introduction of a colonnade andentablature (of the Grecian Doric order) terminated byan octastyle portico and pediment on the abutment ateach end, the heavy and unsightly appearance which solarge a surface of tank would have presented, is got ridof, and a light and elegant character is given to the struc-ture. The suspending-rods pass through the columns tothe ends of the transverse bearers; and the steps uponwhich the columns appear to rest serve to conceal thetransverse bearers, as well as further to maintain thearchitectural effect.
The following are the principal dimensions and parti-culars :—
Span of the suspending arcs . . .
Width between the suspending rodsLength of trough between the abut-ments .
Width of trough.
Depth of trough.
Depth of water (sometimes 8J feet)
ordinarily.
Diameters of suspending rods . .
Thickness of tank-plates (cast-iron) .
Weight of each suspending arc . .
Total weight of iron—cast, 730 tons,wrought, 30 tons ......
Weight of the water in the tank (84
feet deep).
Total weight supported by suspend-ing arcs, including their ownweight.1,700 „
First pile for the foundations driven July 20, 1836.
Aqueduct opened August 8, 1839.
Iron-work executed by Messrs. Graham, Milton IronWorks, near Sheffield.
Masonry by Hugh MTntosh, contractor, BloomsburySquare, London .
[The first cast-iron aqueduct was erected by Telford, A-®'1793, to carry the Shrewsbury canal over the river Tern-
In 1794-5 he designed the celebrated cast-iron aqueductto convey the Ellesmere and Chester canal, at an elevationof 127 feet, over the river Dee at Pont-y-Cysyllte : sincethat time many have been erected. The advantages 0cast-iron aqueducts over those of stone, which are of con"siderable antiquity, are, their security from leakage a®their economy in point of cost.—S. C.J
2. Model of a cast-iron bridge over the river Aire atLeeds . This bridge is represented in the follovri®»engraving.
The objects aimed at in this design have been to combine with apparent lightness, real strength, and by takjnfeadvantage of the facilities afforded by the metal, to g lV !as in the case of the Calder aqueduct, almost ^ jyadditional expense, a pleasing, ornamental, and p ure 'architectural character to a useful engineering work. .
The following are the principal dimensions and P a ‘
culars:—
Span of the arch. 120 feet.
Rise of arch from springing ... 12 »
Width of roadway.30 „
Width of each footpath. 6 »
Total width outside to outside . . 434 »
Weight of cast-iron. 410 ^ton .
Weight of wrought-iron .... 5j »
First pile for foundations driven May 1, 1841.
Bridge opened to the public, July, 1842. v
Iron-work executed by Messrs. Booth & Co-,
Iron Works, Sheffield. r
Masonry executed by Mr. James Bray, contraMoor Park, Harrogate. . elJ
Both the above models were made by Mr.
Salter, Elvan Cottage, Hammersmith, London ; cahand from crayon paper made into cardboard, an ^ eta ;is(as nearly as can be done on so small a scale) theof the iron-work, &c. (Main Avenue West.'}
155 feet.304 „
105 „
‘ 2 ’>
2| inches.3i „101 tons.
760 „
940 „