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 357
s from parallax. If thethree lenses are mounted so that their axes are at distances ofabout 3 in., and their focal lengths are from 6J to 7 in., no dis-placement of the image due to parallax can be noticed if theballoon is 800 ft. above the ground level. Professor Miethes camera therefore consists… … FIG. 211. — Camera forthree-colour photogra-phy. L THE I-NTEKPBETATION OF PHOTOGEAPHS. 838 any accidental injury that might be caused by jolts or knocks.Tbe inside of the box is divided into three compartments, corre-sponding to the three lenses. The plate is 8J by 9% in., and issimilarly divided…
Aeronautics
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