Airships past and present, together with chapters on the use of balloons in connection with meteorology, photography and the carrier pigeon . Fig. 78.—Cookings parachute. shown that with pressures on the surface of the parachute of0*2, 0*4, 0*8, 1*6 and 3*2 lbs. per sq. ft. respectively, thecorrespondingly final velocities will be 7*87, 11 5, 164, 226, and328 feet per second. It is very important to provide a smallopening at the top of the parachute, so that the compressed air 126 AIKSHIPS PAST AND PEE SENT, has some chance of escaping. Otherwise a vibratory motion,like that of a pendulum, may
Airships past and present, together with chapters on the use of balloons in connection with meteorology, photography and the carrier pigeon . Fig. 78.—Cookings parachute. shown that with pressures on the surface of the parachute of0*2, 0*4, 0*8, 1*6 and 3*2 lbs. per sq. ft. respectively, thecorrespondingly final velocities will be 7*87, 11 5, 164, 226, and328 feet per second. It is very important to provide a smallopening at the top of the parachute, so that the compressed air 126 AIKSHIPS PAST AND PEE SENT, has some chance of escaping. Otherwise a vibratory motion,like that of a pendulum, may be set up, and in an extreme case,the parachute may be turned over. Poitevins parachute had a
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Keywords: ., bookcentury1900, bookdecade1900, bookpubl, booksubjectaeronautics
