. American engineer and railroad journal . Fid. SCl-WHEELER BOILER, a Newspaper Clipping. bent the units would strongly suggest several more modernboilers previously described (Stirling, Pierpont, etc.). If the Firmenich units were placed vertical instead of at anangle, we have the Wheeler boiler (fig. 36), which came to usas brand new about the time the last of the Firmenichs washeard from. The Yarrow boiler (fig. 37), is a slightly modified Firmenich(1875), in some instances made with small diameter drums. Fio. 37-YAUROW Notes of Naval Progress, I. A. Navy, 1891. bolted
. American engineer and railroad journal . Fid. SCl-WHEELER BOILER, a Newspaper Clipping. bent the units would strongly suggest several more modernboilers previously described (Stirling, Pierpont, etc.). If the Firmenich units were placed vertical instead of at anangle, we have the Wheeler boiler (fig. 36), which came to usas brand new about the time the last of the Firmenichs washeard from. The Yarrow boiler (fig. 37), is a slightly modified Firmenich(1875), in some instances made with small diameter drums. Fio. 37-YAUROW Notes of Naval Progress, I. A. Navy, 1891. bolted together in the centre, in larger sizes with the upperdrums of sufficient diameter lo draw the tubes into. As in allthis class, the drums are greatly weakened by the large num-ber and close proximity of the tube holes, and the sheet is lia-ble to be strained or ruptured by expanding the tubes. Whena tube leaks it is difficult to locate it, and hidden leaks are lia-ble to cut out the metal. In the smaller sizes the tubes are accessible for cleaning by taking the boiler apart or by work-ing in the dark and trusting to luck in the larger ones. Babcock & Wilcox built a sectional boiler (fig. 38) withstraight vertical headers. The lubes were brightened, laid in
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectrailroadengineering
