Millikan, Robert Andrews, Gale, Henry Gordon · Boston : Ginn and Co. · leaf 244
(I air register … l^er second,the area of Fig. 201. Hot-air heatiiiff 3 feetHence opening required foreach person whenfresh air is enteringat this speed isabout 2.5 or 30square inches. Themanner of supply-ing this requisite amount of fresh air in dwelling houses depends upon the particular method of heating…
Physics
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