A history of the growth of the steam-engine . Fio. 109.—stationary Locomotive Boiler. expedients are sometimes adopted, having for their objectthe increase of heating-surface, without change of form ofboiler and without proportionate increase of cost. One of these methods is that of the use of Gallowayconical tubes (Fig. 110). These are very largely used in. STATIONARY ENGINES. 343 Great Britain, but are seldom if ever seen in the UnitedStates. The Cornish boiler, to which they are usually ap-plied, consists of a large cylindrical shell, 6 feet or more indiameter, containing one tube ofabout o
A history of the growth of the steam-engine . Fio. 109.—stationary Locomotive Boiler. expedients are sometimes adopted, having for their objectthe increase of heating-surface, without change of form ofboiler and without proportionate increase of cost. One of these methods is that of the use of Gallowayconical tubes (Fig. 110). These are very largely used in. STATIONARY ENGINES. 343 Great Britain, but are seldom if ever seen in the UnitedStates. The Cornish boiler, to which they are usually ap-plied, consists of a large cylindrical shell, 6 feet or more indiameter, containing one tube ofabout one-half as great dimen-sions, or sometimes two of one-third the diameter of the shelleach. Such boilers have a verysmall ratio of heating to grate ^^ jj^ surface, and their large tubes are peculiarly liable to collapse. To remove these objections,the Messrs. Galloway introduced stay-tubes into the flues,which tubes are conical in form, and are set in either a ver-tical or an inclined position, the larger end area of heating-surface is thus greatly increased, and,at the same time, the liability to collapse is reduced. Thesame results are obtained by another device of Galloway,which is sometimes combined with that just described inthe same boiler. Several sheets in the flue have pock-ets worked into them, which pockets project into the fl
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Keywords: ., bookcentury1800, bookdecade1870, bookidc, booksubjectsteamengines
