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 320
ch are nearest the red end of the scale. BALLOON PHOTOGRAPHY. 299 Red and yellow seem bright; green, blue and violet seem muchduller. But on a photographic plate the reverse is the case.The blue and violet rays have the greatest actinic effect, thered ones have the least. Consequently the print… … Fig. ISO.—Photograph of a. village, taken in daylight by the Vega Company, ofGeneva. It should be compared with the similar photograph taken by thelight of a projector on the next page. graphic plate is altogether different from the physiologicalimpression produced on the eye. Even if the colouring…
Aeronautics
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