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Firebox (steam engine)
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===Belpaire firebox=== Normally the top of the boiler (wrapper sheet) over the firebox is radial to match the contour of the boiler; however, due to the problem of placing stays at right angles to both the wrapper sheet and the crown sheet (see above) the [[Belpaire firebox]] was developed. In the Belpaire design, the wrapper sheet is roughly parallel with the firebox sheets to allow better placement of the stays. This arrangement gives the firebox end of the boiler a more square shape and is usually made as large as possible within the [[loading gauge]], to offer the greatest heating surface where the fire is hottest. The most notable user of the Belpaire firebox in the United States was the Pennsylvania Railroad. Other railroads, such as the Great Northern and Illinois Central, had locomotives with Belpaire fireboxes. Illinois Central 4-6-0 #382, Casey Jones' engine, had a Belpaire firebox. Steam is usually collected at the front corners of a Belpaire firebox, allowing for a domeless boiler. The top of the firebox, rather than being horizontal, is visibly higher at the front than at the rear to reduce the risk of water being carried over with the steam.
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