A Treatise On The Principles And Practice Of Dock Engineering

BRIDGE PIVOT AT FLEETWOOD. 433 eut off, through any failure of the automatic apparatus, there is nothing to prevent the pivot being driven completely out of the cylinder, with disastrous conséquences to the bridge. This has actually occurred in two instances to the author’s knowledge. A solid pivot is, therefore, to be preferred on this account. Any accident to a bridge over an important waterway entails loss and inconvenience far exceeding the damage to the structure itself. View transverse to the Bridge. Ins.,6,,,,,f££?Feet View longitudinal with the Bridge. Figs. 414 and 415. —Bridge Pivot at Fleetwood. (/) A water-borne carriage, consisting of a buoy continuously immersed, with a very small central pivot beneath it, taking about 5 per cent, only of the dead weight of the bridge. The carriage is steadied by a horizontal ring of wheels. Fig. 418 is an illustration of a pivot thus constructed at the Spencer Dock, Dublin. A practical point worthy of notice is the very decided tendency exhibited 28