The encyclopdia britannica; a dictionary of arts, sciences, literature and general information . ing raised have an opportunity of settling to the bottom of this drum, where the heating is not great and where therefore their presence will not be injurious. When superheaters are required, they are made of two_ drums connected by numerous small tubes, and are somewhat similar in construction to the boiler proper. The superheater is placed between the first and second sets of tubes, where it is exposed to the furnace gases before too much heat has been taken from them. Arrangements are provided f
The encyclopdia britannica; a dictionary of arts, sciences, literature and general information . ing raised have an opportunity of settling to the bottom of this drum, where the heating is not great and where therefore their presence will not be injurious. When superheaters are required, they are made of two_ drums connected by numerous small tubes, and are somewhat similar in construction to the boiler proper. The superheater is placed between the first and second sets of tubes, where it is exposed to the furnace gases before too much heat has been taken from them. Arrangements are provided for flooding the superheater while steam is being raised, and for draining it before the steam is passed through it. BOILER 145 A somewhat similar boiler is made by Messrs. Clarke, Chapman &Co., and is known as the Woodeson boiler (fig. 13). It consistsWoodeson °^ thiee upper drums placed side by side connected? together by numerous short tubes, some above and somebelow the water-level, and of three smaller lower drums also con-nected by short cross tubes. and lower drums are. Fig. II.—Babcock & Wilcox Water-tube Boiler fitted with Superheaters. connected by numerous nearly vertical straight tubes. The whole isenclosed in firebrick casing. The design permits of the insidesof all the tubes being readily inspected, and also of any tubebeing taken out and renewed without displacing any other partof the boiler. The earliest forin of water-tube boiler which came into general usein the British navy is the Belleville. Two views of this boiler areBelleville, shown in fig. 14. It is composed of two parts, the boilerproper and the economizer. Each of these consists ofseveral sets of elements placed side by side; those of the boilerproper are situated immediately over the fire, and those of the Safetg alm^^^^^X « and except in the case of the upper and lower ones at the front of theboiler, each connects the upper end of one tube with the lower endof the next tube of the eleme
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectencyclo, bookyear1910
