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 353
ays is also an indi-cation of the nature of the ground. They appear in greatnumbers on both sides of the railway siding, and would beclearly impossible on flat ground. The distribution of light and shade depends on the lie of theland, and conclusions can often be drawn in consequence as towhether… … vegetation may cause an appearance of shadow. Water is gene-rally easily recognised ; rivers run their course along well-definedcurves, which are at once recognised on paper. They probablyappear to resemble roads in so far as their brightness is THE INTEKPEETATION OF PHOTOGEAPHS. 329 concerned ;…
Aeronautics
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