Hiscox, Gardner Dexter, 1822?-1908 · New York, The Norman W. Henley publishing co. · leaf 198
AIR POWER APPLIANCES, 187 … 696. VENTILATOR OR COWLFOR A CHIMNEY TOP.—The cor-rugated edges of the outside guardring intensify the draft by directngthe wind in a vertical direction. 697. A WIND GAUGE for obtain-ing the force of the wind in inchesheight of water, from which the windpressure per square foot may be ob-tained…
Mechanical movements
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