Airships past and present, together with chapters on the use of balloons in connection with meteorology, photography and the carrier pigeon (1908)
Hildebrandt, A. (Alfred), b. 1870, Story, W. H. tr · New York, D. Van Nostrand company · leaf 268
discs in rotation. The rotation ofthese discs sucks the air through the central tube, and con-sequently past the thermometer bulbs, at a speed of 8 or 10 ft. per 1 See Assmanns Wissenschaftliche Luftfahrten, vol. i., page 56. SCIENTIFIC BALLOONING. 247 second. The rays of the sun are reflected by… … Fig-. 150.—Basket fitted with instruments according to the method proposed by Assmann. temperature of the atmosphere can be found, supposing that thethermometers are kept at a sufficient distance from the observers,etc., to be free from any of the effects of radiation that may bedue to the contents…
Aeronautics
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