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A cowl is a usually hood-shaped covering used to increase the draft of a chimney and prevent backflow. The cowl, usually made of galvanized iron , is fitted to the chimney pot to prevent wind blowing the smoke back down into the room below.
A chimney pot is placed on top of the chimney to expand the length of the chimney inexpensively, and to improve the chimney's draft. A chimney with more than one pot on it indicates that multiple fireplaces on different floors share the chimney. A cowl is placed on top of the chimney to prevent birds and other animals from nesting in the ...
Cowl or cowling, a removable protective covering over all or part of an engine; Cowl (chimney), a device fitted to a chimney pot to prevent wind blowing the smoke back down into the room beneath; Cowl (oast), the revolving device found on oasts, maltings, and breweries; Cowl unit, a body style for locomotives
Since the beginning of the Industrial Revolution, tall chimneys were built, at the beginning with bricks, and later also of concrete or steel.Although chimneys never held the absolute height record, they are among the tallest free-standing architectural structures and often hold national records (as tallest free-standing or as overall tallest structures of a country).
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These cowls were controlled by steam-operated cylinders and, when not required, could be withdrawn longitudinally from the position over the chimney orifice. Since Garratts are designed to be bi-directional, the problem was eventually solved by simply running them with the chimney trailing on the ascending legs of the tunneled routes.
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