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 363
Fig. 215.—Batuts kite for photographicapparatus. Fig. 216.—Panoramic apparatusfor a balloon without observers. w^as an astigmatic one by Zeiss, had a focal length of 2J in., andthe plates wTere 4f by 4|, subtending at the lens an angle of 88°;the photographs therefore overlapped one another by 14°.…
Aeronautics
Internet Archive · Library of Congress · Public Domain Mark 1.0. Free to use for anything.
