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haycock boiler
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. This particularly large outer firebox served as the steam dome and was often highly decorated with polished brass. These were popular for early railway locomotives, from 1840 to the 1850s.
== Haystack firebox ==
The prominently raised firebox first appeared in 1830, in Bury's 0-4-0 locomotive ''Liverpool''. This was the progenitor of his bar-frame locomotives and shared their distinctive boiler design. The inner firebox was D-shaped in plan, with a flat tubeplate. Fireboxes of this time did not yet have a brick arch and so the Bury firebox was relatively short in length but tall, to give an adequate length of combustion path. The outer firebox was a vertical cylinder, formed into a tall hemispherical dome above it. Later Bury designs were flattened on top and became known as "haystacks".〔
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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