A treatise on architecture and building construction (1899)
International Correspondence Schools · Scranton, The Colliery engineer co. · leaf 242
. If the inner tubes of agroup can be fully sup-plied with cold air, in some manner, they will be as usefulas the outer tubes. When forced circulation is employed,there is little difficulty in driving the cold air over all thetubes; but, with natural draft only, it is necessary to modify the shape… … a /////,//,
Architecture · Building
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