1851 Great Exhibition: Official Catalogue: Class VII.: William Bell

63 BELL, WILLIAM, 40 Pickering Place, Paddington — Inventor.

Suspension-bridge for railway purposes, made rigid by girders attached to the suspension chain. Suspension-bridge on the same principle, designed for northern rivers, thickly frozen in winter, so as not to impede the passage of the ice when it breaks up.

Bridge of one arch, of 250 feet span, designed for ornamental waters. Constructed on the tensile principle, and calculated to support with safety a load of 472 tons.

Roof, of 400 feet span.

Self-acting flood-gate, for keeping up a uniform head of water in mill-dams, weirs, etc.

[The power of the same water wheel depending upon the quantity of water admitted upon it, and uniform motion being requisite in the prime mover of all machinery, it follows that the height of water in the milldam should be maintained at an uniform level, or a self- acting sluice worked by a varying head, added so AS to regulate the supply. If the first can be attained with certainty, it will ensure more perfect action.- S C.]

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