Mechanical movements, powers, devices and appliances; (1903)
Hiscox, Gardner Dexter, 1822?-1908 · New York, The N.W. Henley & co. · leaf 196
AiR POWER APPIvIANCES, 187- … 696. VENTILATOR OR COWL-FOR A CHIMNEY TOP.—The cor-rugated edges of the outside guardring intensify the draft by directng-the wind in a vertical direction. 697. A WIND GAUGE for obtain- ing the force of the wind in inches height of water, from which the wind , pressure per square foot may be ob-…
Mechanical movements
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