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 213
about aneroids, which can be corrected by gentle tapping.The method, which has been described, of throwing out pieces of paper or feathers forms auseful indication of a rise orfall, and may conveniently sup-plement the use of the baro-meter. On an ascent in a free balloon,a barograph is always… … Fig. 118.—Aneroid barometer. no means indispensable, but a compass must be taken in any case.For meteorological observations, a wet and dry bulb thermo-meter, preferably of the Assmann type, should be taken, inorder to measure the temperature and the moisture in theatmosphere. Eadiation is,…
Aeronautics
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