Mechanical equipment of buildings; a reference book for engineers and architects (1916)
Harding, Louis Allen, Willard, Arthur C. (Arthur Cutts), 1878-1960 · New York Wiley · leaf 57
Fig. 23. Dktails of Oaugixg Box and Orifice. with a cu-cular orifice as shown, discharging directly into the air. The static pressure existingwithin the box is measured by means of a U tube, which indicates the difference in pressure ininches of water between the two sides of the orifice. The…
Building · Heating · Ventilation
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