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Knight's Mechanical Encyclopedia (ed. Knight), L. (search)
ius Hostilius. Cresy dates the introduction of locks from the period of the building of this canal. It was a curious contrivance called a conch, with a balance-lever and hanging gate, which somehow opened to allow the boats to pass. This was used at Governolo, to dam up the waters of the Mincio on the side of Mantua. It was probably a kind of sluice. See Cresy's Ency. Civil Engineering, pp. 185 – 188. Canal-lock. The first canal-lock in England was constructed by John Trew of Glamorganshire for the Exeter Canal. The lock-chambers were 300 feet in length, 80 in breadth at top, 50 at the bottom. The gates were in pairs, at each end, 25 feet high, and each leaf 20 feet wide, furnished with iron and brass work that they might be moved with facility. Sluices were made to admit and remove the water in locking. The object was to ascend to a level in the river Ex, above a weir constructed across the river. This account disproves the statement that locks were introduced into
Knight's Mechanical Encyclopedia (ed. Knight), S. (search)
d proportions of arches. 1. Vielle Brionde, over the Allier. 2. Holy Trinity, over the Arno. 3. Pont-y-Prydd. over the Taaf. 4. Mantes, over the Seine. 5. Blackfriars, over the Thames. 6. St Mascence, over the Oise. 7. Waterloo, over the Thames. 8. Gloucester, over the Severn. 9. London, over the Thames. 10. Chester, over the Dee. 11. Great Western Railway, over the Thames at Maidenhead. A remarkable bridge (3) was built in 1751 across the Taaf, in Glamorganshire, Wales, by William Edwards, a country mason. He had previously erected two bridges on the same spot: the first was carried away by a sudden and extraordinary flood; the second by the crowding up of the crown of the arch by overloading its haunches before the parapet was finished. Peronnet could have taught him better, but Edwards was a skillful and persevering man, and ultimately succeeded. The present bridge has a span of 140 feet, rise of 35 feet, and is a segment of a circle 175