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A chimney cowl or wind directional cap is a helmet-shaped chimney cap that rotates to align with the wind and prevent a downdraft of smoke and wind down the chimney. An H-style cap is a chimney top constructed from chimney pipes shaped like the letter H. It is an age-old method of regulating draft in situations where prevailing winds or ...
Cowls often also act as a rain guard to keep rain from going down the chimney. A metal wire mesh is sometimes added as a spark arrestor. Wooden cowls were used on oasts to prevent the ingress of rain into kilns, and create a flow of air through the kiln. An H-style cap (cowl) is a chimney top constructed from chimney pipes shaped like the letter H.
Breccia is typically silicified and consists of many smaller irregular rock fragments. Breccia pipe cutting Eday Sandstone, Ophir Bay, Orkney. A breccia pipe, also referred to as a chimney, is a mass of breccia (rock composed of broken fragments of minerals or rock cemented together by a fine-grained matrix), often in an irregular and cylindrical shape.
During the 1950s further experiments were carried out with the fitting of a British Railways Standard Class 4 plain blast pipe and small stovepipe chimney to no. 30549 in 1955, resulting in further improvements in both steaming and fuel consumption; in 1958–61 more received the same blast pipe with a BR Standard Class 4 chimney. [8] [9]
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The Blast Pipe (a) directs exhaust steam into the smokebox (b). The steam entrains the smoke from the firebox (c), creating more draft which helps speed the smoke out the chimney (d). The primacy of discovery of the effect of directing the exhaust steam up the chimney as a means of providing draft through the fire is the matter of some ...
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