The smoke box is formed by extending the cylindrical part of the boiler beyond the front flue sheet. This arrangement provides that all parts of the firebox, as well as the flues, are completely surrounded by water, and it also provides that when fuel is burned in the firebox, the heat will be transmitted by the flues and firebox plates to the water the unused gasses and smoke having free passage from the firebox through the flues to the smokebox and smokestack. The front or cylindrical part of the boiler encloses the flues which are secured at the front to the front flue sheet and at the back to the inner or firebox flue sheet. The firebox corresponds in shape to the back end and sides of the outer casing or shell, a space being provided between the firebox sheets and those of the outer casing which provides for the firebox being surrounded by water. That part of the boiler enclosing the firebox is known as the outer casing or shell. Locomotive Construction and Parts The Boiler Ī common later (the 1940s) boiler design was the radial stay extended wagon top type of locomotive boiler, which consists of an oblong box with a circular top made of steel plating, connected to a cylindrical part which is commonly known as the barrel of the boiler. 1.3 Effects of Heating, Cooling, and Low Water.
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