Cyclopedia of architecture, carpentry, and building : a general reference work ... (1907)
American School of Correspondence · Chicago : American Technical Society · leaf 67
hour, and an average efficiency of 60 per cent, 49 40 HEATING AND VENTILATION which corresponds to (S,()00 B. T. U. per pouml of coal* avaihible foruseful work. In the case of direct-steam heating, we have only to supply heatto offset that lost by rachation and con(Uiction; so that the grate… … Fig. 13. Commou Type of Cast-iron Sectional Boiler. Note Header.s at Sides and Top Acting as Oriuns. combustion will depend somewhat upon the ratio between the grateand heating surface. It has been found by experience that about \of a pound of coal per hour for each .square foot of heating…
Architecture · Building · Carpentry
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