why a chimney used in a boiler?
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A chimney is an architectural ventilation structure made of masonry, clay or metal that isolates hot toxic exhaust gases or smoke produced by a boiler , ...
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Explanation:
Chimneys are used with loco boilers, but they are fitted on the smoke box. But recently steamies have started to get shorter chimneys to reduce the air resistance acting on it when the train is at high speed. Locomotives like Mallard A4 have the specially designed chimneys so short that it is not easily spotted.
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