A history of the growth of the steam-engine . Fio. 111.—Harrisons Sectional Boiler. and fitted together with faced joints. Long bolts, extend-ing from end to end of each row, bind the spheres together.(See Fig. 111.) An example of another modern type in extensive use isgiven in Fig. 112, a semi-sectional boiler, which consists ofa series of inclined wreught-iron tubes, connected by T- 346 THE STEAM-ENGINE OP TO-DAY. heads, which form the vertical water-channels, at each joints are faced by milling them, and then ground soperfectly tight that a pressure of 500 pounds to the squareinch i
A history of the growth of the steam-engine . Fio. 111.—Harrisons Sectional Boiler. and fitted together with faced joints. Long bolts, extend-ing from end to end of each row, bind the spheres together.(See Fig. 111.) An example of another modern type in extensive use isgiven in Fig. 112, a semi-sectional boiler, which consists ofa series of inclined wreught-iron tubes, connected by T- 346 THE STEAM-ENGINE OP TO-DAY. heads, which form the vertical water-channels, at each joints are faced by milling them, and then ground soperfectly tight that a pressure of 500 pounds to the squareinch is insufficient to produce leakage. No packing is 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 KALEVIMA
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Keywords: ., bookcentury1800, bookdecade1870, bookidc, booksubjectsteamengines
