File:Appletons' cyclopaedia of applied mechanics- a dictionary of mechanical engineering and the mechanical arts (1880) (14594169870).jpg

Identifier: appletonscyclopa02dapp (find matches)
Title: Appletons' cyclopaedia of applied mechanics: a dictionary of mechanical engineering and the mechanical arts
Year: 1880 (1880s)
Authors: D. Appleton and Company Benjamin, Park, 1849-1922
Subjects: Mechanical engineering -- Dictionaries
Publisher: New York, D. Appleton
Contributing Library: Mugar Memorial Library, Boston University
Digitizing Sponsor: Boston University

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, and the joints made by lapping the sheets one on another. The outside fire-boxcrown-sheet is usually raised above the cylindrical portion of the boiler, giving thus a larger steam-space ; and the outside width of the fire-box is at the top, usually more than the diameter of theboiler, narrowing toward the bottom (see Fig. 2848), where it is limited by the locomotive frame.The fire-box outside shell unites with the cylindrical part by a short portion of the boiler, of conicalshape, which is made of two sheets, one at the top, the other at the bottom. In this country a steam-dome Ais always placed at the crown-sheet. In Europe it is usually located in the neighborhood ofthe smoke-box, the opinion prevailing that the steam is there drier, and that an advantage is gainedby the shortening of the steam-pipes leading to the cylinders, which are placed on the outside of theboiler. The inside fire-box shell, or the fire-box proper, consists of two side sheets commonly bent .t„.„-i--3v-.t
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into form corresponding to the outside form, a door-sheet, a waist or front sheet, a crown-sheet, g g,which is either of flat or semicircular shape—the latter being now favorably regarded by manyengineers—and a tube-sheet, a a, to which the fire-tubes are fastened. At the bottom, the two fire-box shells are joined, and the water-space between them closed, by a wrought-iron bar, which isriveted to them and makes a tight joint. The fire-door channel C is of sheet iron, and is riveted tothe two back sheets. The doors are of cast iron, hinged, and provided with a latch, and often haveair-holes with a slide to close or to open them. The fire-tubes are made tight at the fire-box tube-sheet, usually by expanding them at that place into a tapered shape to fill the hole, lapping the endsover the sheet, and, at the inside edge of the sheet, expanding them into a ridge. A short copperferrule on the outside of the tubes is used for tightening these joints. At the smoke-box end thetubes are si

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