The Viaduct Works' Handbook

69 roof is composed of iron trusses resting on the stanchions, and are, therefore, 6 feet 6 inches apart; they are covered with 14-inch boarding and asphalted felt. The trusses in the roof are composed of 3 x 3 x § T iron, trussed with round bars and struts, and the T iron and roofing are produced beyond the walls of the building suffi- ciently to form a covered verandah, 5 feet wide, on each side, the overhanging portion being supported at its extremity by cast-iron columns, which rest upon the floor bearers, which are also produced .to the width of the verandahs, and have their extremities supported upon cast-iron foundation piers of a larger size than those already mentioned, so as to form anchorage in the ground. The windows are of wood casements in iron frames; partitions are of double boarding, two thicknesses each, I of an inch, stiffened by iron bars. The end walls are of boarding, similar to the sides, but stiffened by triangular iron buttresses made of light angle iron and rivetted flat bars, and attached at top by bolts to the trusses of roof, and at bottom to the floor joists. The cost of ironwork for huts, as above, 100 feet long, 20 feet wide, about 14 feet average height, is about 2d. per cube foot of building. Other buildings in iron, of great variety, including wrought and cast-iron verandahs and staircases, and lighthouse buildings, are also made at these Works, from which we select one represented by the accompanying engraving, representing an example of a class of building made for Spain, composed chiefly of iron and glass, and this building is 100 feet long, 50 feet wide, and is used as a conservatory. The same class of work would be applicable to exhibition buildings, &o. It is made in three spans, the centre one being largest. The ribs are of light T iron, well braced together, and springing from the tops of wrought-iron columns, forming the main framing, which is covered all over with wrought-iron sash bars and glass. The scrolls and decorations are of cast-iron. The whole building is very econo- mical and durable, and costs about £1600 deld. f.o.b. in this country, including doors and fittings, or about £30 per square covered on plan.