A treatise on architecture and building construction (1899)
International Correspondence Schools · Scranton, The Colliery engineer co. · leaf 233
Fig. 16. 36 HEATING AND VENTILATION §17 57. The beneficial effect of the ordinary horizontal winds upon the draft of a chimneymay be increased by means ofthe circular deflector C, shownin Fig. 17. That part of thewind which is intercepted bythe curved surface of C isdeflected strongly upwards… … Fig. 17 COAVLS. 58. The term co^vl is applied in a general way to allapparatuses or fixtures which are placed over the top ofchimneys or ventilating flues, etc., to aid the draft. Theyserve to protect the ascending current of hot gases withinthe flue from the influence of contrary wind currents,…
Architecture · Building
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