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 319
covered = 2overcast — 3heavy clouds = 6 4 1 298 AIBSHIPS PAST ANP PBESENT, Colour values must also be considered. The eve sees no suchdifferences between light and shade in a balloon as are noticed on the earth. The shadows seem to be so strongly lighted thatin the distance they almost entirely… … Fig, 185.—Clouds over the Alps.(Photograph \ S] a monochromatic reproduction of a colour effect grades onecolour into the next by a mere or less abrupt change from lightto dark. Nobody can say exactly how dark a certain patchought to be in order to give effect to the colour of an object, andthis…
Aeronautics
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