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Babcock & Wilcox Water-tube Boiler with Superheaters, as fitted for land purposes, consists of a horizontal cylinder forming a steam chest, having dished ends and two specially contructed cross-boxes riveted to the bottom. Under the cylinder is placed a sloping nest of tubes, under the upper end of which is the fire. The sides and back of the boiler are enclosed in brickwork up to the height of the centre of the horizontal cylinder and the front is fitted with an iron casing lined with brick at the lower part. Suitable brickwork baffles are arranged between the tubes themselves, and between the nests of tubes and the cylnder, to ensure a proper circulation of the products of combustion, which are made to pass between the tubes three times. The nest of tubes consists of several separate elements, each formed by a front and back header made of wrought steel of sinuous form connected by a number of tubes...... Any desired working pressure can be provided for in these boilers; in some special cases it rises as high as 500 lb per sq. in., but a more usual pressure is 180 lb.
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