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 350
ketch showsthat the rise on the side of a hill would be much more marked,and the fact that one house appears to project above its neigh-bour is not enough to prove the ground to be hilly. The roadsare very clearly visible, with their white dust and rows of trees.Country paths are often very… … Fig. 204. found at once, even if its existence is already shown onthe map. Boads are often a good indication of a change of level. Whena road disappears, as in the photograph of Blankenburg, betweenthe points k-k, it is easy to see that it is hidden from sight by aslight hill. It is not so easy to…
Aeronautics
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