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 279
ly brought into contact with fresh.a. s 258 AIKSHIPS PAST AND PRESENT. volumes of air, in a manner similar to that adopted in theaspirator-psychrometer. If the balloon is made to rise quicklyand then to fall at once, the thermometers give correct values;but if it is allowed to drift gently along,… … Fig. 161.—Ascent of a box-kite containing meteorological instruments(Photograph by the Berliner Illustrationsgesellschaft.) this is not sufficient. Kites have been sent up in the earlymorning before sunrise, and figures, obtained in this way, havebeen compared with those recorded in bright…
Aeronautics
Internet Archive · Library of Congress · Public Domain Mark 1.0. Free to use for anything.
