A treatise on architecture and building construction (1899)
International Correspondence Schools · Scranton, The Colliery engineer co. · leaf 233
erbalance and reverse it. They alsoserve to facilitate theescape of the warm gasesinto the area of lowerpressure, which alwaysexists upon the leewardside of a chimney or ven-tilating shaft while thewind is blowing. Duringcalm weather, a cowlalways obstructs the draftsomewhat. A common form of… … Fig. 18. 17 OF BUILDINGS. 37
Architecture · Building
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