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 261
clouds was determined bythrowing out a number of cards. The description of the prepara-tions that were- made for the journey shows that it was done on 240 AIRSHIPS PAST AND PEE SENT. strictly scientific lines with the greatest care, and the results areinteresting, though no account was taken of the… … Fig. 14G.— Dr. Jeffries with the barometer used on his ascents. has already been described in some detail. It maybe noted thaton this occasion the first trigonometrical observations of theheight of a balloon were made from the French coast, and thealtitude was found to be 4,800 ft. No barometric…
Aeronautics
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