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Firebox of a GWR 6959 Class steam locomotive, showing the underside of the brick arch, constructed from specially-shaped firebricks. Empty firebox of a Baureihe 52, showing the brick arch. There is a large brick arch (made from fire brick) attached to the front wall (boiler throat plate) of the firebox immediately beneath the firetubes. This ...
French locomotive L'Aigle. A haycock boiler is an early form of steam locomotive boiler with a prominently raised firebox of "Gothic arch", "haystack", or "coppernob" shape. The term haystack is most commonly used, but is avoided here as it is confusingly used for three quite different forms of boiler. [1]
Fire-tube boilers sometimes have water-tubes as well, to increase the heating surface. A Cornish boiler may have several water-tubes across the diameter of the flue (this is common in steam launches). A locomotive boiler with a wide firebox may have arch tubes or thermic syphons.
The hatched circles show the outline of the barrel to which the firebox was attached. A Round-topped firebox cross section shown for comparison. Note the angling of the stays. Pacific-type flat-topped inner firebox. The Belpaire firebox is a type of firebox used on steam locomotives. It was invented by Alfred Belpaire of Belgium in 1864. Today ...
Firebox (steam engine) H. Haycock boiler; P. Pistol boiler; R. Round-topped firebox; W. Wootten firebox This page was last edited on 3 February 2011, at 11:44 ...
The square-topped Belpaire firebox allows steam to be conveniently collected at its top corners and therefore locomotives with Belpaire fireboxes often dispensed with a dome, for example express engines such as the GWR Castle Class (the large brass boiler fitting on a Castle is the distinctive GWR safety valve cover, not a dome).
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Either a fire-tube or water-tube that is entirely below the water-level of the operating boiler. As corrosion and scaling is most active in the region of the water-level, this reduces wear and maintenance requirements. Exhaust injector A feedwater injector that economizes on steam consumption by using waste steam, such as engine exhaust.