The Works Of Messrs. Schneider And Co.

152 MESSRS. SCHNEIDER AND CO.’S WORKS. ones 28 metres (92 ft.) wide. The distance between each truss is the same for the three halls, namely, 10 metres (32 ft. 10 in.) from centre to centre of the principal rafters. The whole of the ironwork weighs 1.400 tons (see Figs. 504 and 505). The érection had to take place, as is always the case when railway stations are transformed, without interfering with the traffic and without endangering the life of the girders, and are placée! 12.45 metres (40 ft. 10 in.) apart from centre to centre. The purlins are 3.84 metres (12 ft. 8 in.) apart, and are trellised on their whole length. There are three rows of rafters per roof-bay; these rest on the purlins through the interposition of curved brackets. The rafters carry a series of iron U-shaped bars, on which is fixed the roofing. The roofing consista of alternats series of corrugated sheets and glass. Strong stays, Fig. 504. Erection of the Orleans Railway Station, Paris. Fig. 505. Interiør of the Orleans Railway Station, Paris. Fig. 506. Santiago (Chili) Railway Station. Fig. 507. Machinery Hall, Paris Exhibition, 1878. passengers and employés. To this end the framework was raised and erected with the help of a gigantic gantry, pro- vided at varions levels with érection floors and derricks. Santiago (Chili) Railway Station (1897).—This is quite a recent construction ; it has been carried out on modern lines, in such a manner as to obtain the maximum free space available (see Fig. 506). The trusses are made with three hinges and without tie-rods. They are of 48.20 metres (158 ft. 3 in.) spån ; the height to the ridge plate is 25 metres (82 ft.) ; they are made with trellis-box placed under the U-shaped pieces, unité all the trusses, thus forming a series of inclinée! girders which largely inerease the stability of the building. The gable-end is ornamented in the mauresque style of cast-iron fittings. The total weight of the ironwork is 1,000 tons. This roof was erected during a period of very great traffic, with which it did not at all interfère. The scaf- folding consisted of two distinct parts, the storing stage for the material and the erecting gantry ; the storing