Engineering Wonders of the World
Volume I

334 ENGINEERING WONDERS OF THE WORLD. ties below. Regular workshops were erected at this' great elevation, to which derricks ’ lifted the parts of two large Workshops cranes destined to con- struct and travel down the j 1 f top members on a frame from which hung a platform for the workmen. Each Jubilee Crane, as it was named in the construction of the successive struts, ties, and other members of the six bays in each cantilever. Let it suffice it to say that, so far as possible, temporary supports from above and below were employed to ease the strain of the growing girders and their loads. Periodically the positions of the various parts were checked with reference to the centre FIFE CANTILEVERS ALMOST COMPLETED. (By permission of Messrs.' Baker and Hurtzig.) Observe the travelling “Jubilee” Crane at end of nearer cantilever. The Jubilee Cranes. upon to tirely by stiffness hundred fee one honour c£ the year, weighed, with its plat- forms and gear, about sixty-four tons. Yet members were called bear this weight en- virtue of their own till they should have st outwards from the column and met the first supports—tem- porary ones—built up from the bottom booms. The strain on the steelwork was tremendous, and the risk of serious damage by high winds such as to cause the engineers great anxiety until the junction had been effected. It would be tedious to describe in detail line, and corrections made promptly where needed. So well was this part of the work done that the lateral error in an arm nearly 700 feet long did not exceed a couple of inches. Slowly but surely the Jubilee Cranes and their fellows on the railway viaduct and the bottom booms worked their way outwards, till the end posts had been set. By that time 16,678 tons of steel had been built into the columns, and 32,382 tons into the cantilevers. There task of bridging the 350-foot gaps separating The Cantilevers completed. remained the