Airships past and present, together with chapters on the use of balloons in connection with meteorology, photography and the carrier pigeon . 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 see that the part marked e is aconsiderable rocky eminence, called the Begenstein, so little doesit attract attention on the photograph. But the fact that ithi
Airships past and present, together with chapters on the use of balloons in connection with meteorology, photography and the carrier pigeon . 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 see that the part marked e is aconsiderable rocky eminence, called the Begenstein, so little doesit attract attention on the photograph. But the fact that ithides the road between k and k 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 show that the country is hilly. In the parts round a andb there are many gentle curves which fall gradually into thevalleys or more evel ground lying among the hills. Such 326 AIKSHIPS PAST AND PEE 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. These peculiarities can be traced onthe photograph of Kudersdorf, and in many of the others. Theview of the chalk-pits near Kudersdorf is particularly interest-ing ; at a first glance the uneven nature of the ground is notvery striking. The heights of the various points are shown inmetres, and the incline of 1 in 4 in the foreground looks almost
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Keywords: ., bookcentury1900, bookdecade1900, bookpubl, booksubjectaeronautics
