. American engineer and railroad journal . Fie. 9 THE ALLEN BOILER, of American InstiiuU Fair Tetts, 1871. Allen nearly duplicated July of 1857 and Field of 1866,using cast-iron drop tubes (screwed into a horizontal tube aithe top), slightly inclined from the vertical (fig. 9). Wiegand connected groups of vertical tubes, having insidecirculating tubes, to an overhead steam and water reservoir(tig. 10). Caps were screwed on the bottom of the tubes forcleaning(V), but they generally came olT without the assistanceof a wrench. PIambeck& Darkin modified Fletchers design of 1869, substi
. American engineer and railroad journal . Fie. 9 THE ALLEN BOILER, of American InstiiuU Fair Tetts, 1871. Allen nearly duplicated July of 1857 and Field of 1866,using cast-iron drop tubes (screwed into a horizontal tube aithe top), slightly inclined from the vertical (fig. 9). Wiegand connected groups of vertical tubes, having insidecirculating tubes, to an overhead steam and water reservoir(tig. 10). Caps were screwed on the bottom of the tubes forcleaning(V), but they generally came olT without the assistanceof a wrench. PIambeck& Darkin modified Fletchers design of 1869, substituting cylindrical for conical tutus and making his outershell removable (fig. 11). This being taken off, the tubes could be bored out,. :fig. 11. THE PLAMBECK &Fio. WIEGAND BOILEK, 1s?-. DARKIN BOILER. JudgeeReport, Centennial Exhibition, 1876, TraJt Circular, about 1874W. E. Kelley, of New Brunswick, N. J., adopted J. design of 1870, adding a drum or so and a subterra-
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectrailroadengineering
