Cyclopedia of architecture, carpentry, and building : a general reference work ... (1907)
American School of Correspondence · Chicago : American Technical Society · leaf 32
, for■ ^ . Measuring Velocity of Air-Currents. without change in temperature, and the force for moving must be sufficient to overcome the effectsof wind or changes in outside temperature. Some form of fan is usedfor this purpose. Measurements of Velocity. The velocity of air in ventilatingducts and… … 21 12 HEATING AND VENTILATION The revolution of the axis causes motion of tlic hands in ])r()portion tothe velocity of the air, and the result can be read directly from the dialsfor any given period. For approximate results the anemometer may l)e slowly movedacross the opening in either vertical or…
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