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 345
passesfrom a cold atmosphere into a warm, damp one, the surface ofthe lens will be covered with a thin film of moisture, and ablurred exposure would result. It is doubtful whether this matteralways receives sufficient attention. Often enough the sky isperfectly clear, and yet failures are the only… … PHOTOGKAPHIC OUTFIT FOR BALLOON WORK. 321 in a corner of the basket, where it is well protected from the raysof the sun, and it has about the same temperature as the surround-ing atmosphere, which is generally far lower than that of theearth. A film, of moisture has therefore probably coated the…
Aeronautics
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