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 351
shows that it is a hill, though itis impossible to say how high it is. The low level of the balloonis also shown by the way in which the peaks in the backgroundstand out against the horizon. The irregularities in the direc-tion of the roads, and in the appearance of the ploughed land, alltend to… … uneven lines as are shown between m and m would scarcely bepossible on perfectly level country. An ordinary road isgenerally fairly straight and turns abruptly at a bend; in THE INTEEPKETATION OF PHOTOGEAPHS. 327 hilly country they become more serpentine in extreme caseswith many gentle curves.…
Aeronautics
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