A history of the growth of the steam-engine . Fig. 112.—Babcock and Wilcoza Sectional Boiler. The fire is made under the front and higher end of thetubes, and the products of combustion pass up between thetubes into a combustion-chamber under the steam and waterdrum ; hence they pass down between the tubes, then oncemore up through the space between the tubes, and ofE tothe chimney. The steam is taken out at the top of thesteam-drum near the back end of the boiler. The rapidcirculation prevents to some extent the formation of de-posits or incrustations upon the heating-surfaces, sweepingthem a
A history of the growth of the steam-engine . Fig. 112.—Babcock and Wilcoza Sectional Boiler. The fire is made under the front and higher end of thetubes, and the products of combustion pass up between thetubes into a combustion-chamber under the steam and waterdrum ; hence they pass down between the tubes, then oncemore up through the space between the tubes, and ofE tothe chimney. The steam is taken out at the top of thesteam-drum near the back end of the boiler. The rapidcirculation prevents to some extent the formation of de-posits or incrustations upon the heating-surfaces, sweepingthem away and depositing them in the mud-drum, whencethey are blown out. Rapid circulation of water, as hasbeen shown by Prof. Trowbridge, also assists in the ex-traction of the heat from the gases, by the presentationof fresh water continually, as well as by the prevention ofincrustation. PORTABLE AND LOCOMOTIVE ENGINES. 347 Attempts have been made to adapt sectional boilers tomarine engines ; but very little progress has yet been made. Fiu. 113.—Boot Sectional Boiler. in their introduction. The Root sectional boiler (Fig. 113),an American design, which is in extensive use in the UnitedStates and Europe, has also been experimentally placed inservice on shipboard. Its heating-surface consists whoUyof tubes, which are connected by a peculiarly formedseries of caps; the joints are made tight with rubber grummets. Section II.—^Portable and Locomotive Engines. Engines and boilers, when of small size, are now oftencombined in one structure which may be readily transport-ed. Where they have a common base-plate simply, as inFig. 114, they are called, usually, semi-portable little engines have some decided advantages. Beingattached to one base, the combined engine and boiler is 348 THE STEAM-ENGINE OF TO-DAY. easily transported, occupies little space, and may veryreadily be mounted upon wheels, rendering it peculiarlywell adapted for agricultural purposes. The example her
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Keywords: ., bookcentury1800, bookdecade1870, bookidc, booksubjectsteamengines
