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 356
or reference. But theangle from which the objects are photographed makes a differ-ence, and this has to be taken into account. Specially is thisthe case with water, which appears white in reflected light, butmay appear absolutely black if looked at directly from above.Dry, brown leaves will also… … Fig. 210.—This photograph shows the same objects as in the preceding, but it istaken from the side instead of being taken from above. colours of the objects or to the varying illumination. Supposingthe illumination to be uniform, the brightness of the variouscolours is in the following order, viz.,…
Aeronautics
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