Airships past and present, together with chapters on the use of balloons in connection with meteorology, photography and the carrier pigeon . ees. If the whole country is coveredwith snow, and yet shows a number of black patches, this is aclear indication of a forest, and if the trees are not too closelyplanted, they can often be distinguished from one and country paths disappear in the snow, and it isonly the rivers and roads that seem to be black. The rail-way, which passes through the middle of the photograph of thevillage in the Uckermark stands out from the snow, and thetel
Airships past and present, together with chapters on the use of balloons in connection with meteorology, photography and the carrier pigeon . ees. If the whole country is coveredwith snow, and yet shows a number of black patches, this is aclear indication of a forest, and if the trees are not too closelyplanted, they can often be distinguished from one and country paths disappear in the snow, and it isonly the rivers and roads that seem to be black. The rail-way, which passes through the middle of the photograph of thevillage in the Uckermark stands out from the snow, and thetelegraph poles can be seen at the side of the lines. The smalldeclivity at the side of the line is shown by the dark patches, 330 AIRSHIPS PAST AND PRESENT. where the snow has been unable to lodge. In the photographstaken by Spelterini, the snow, rocks, and glaciers are alwaysclearly to be seen. It will therefore be seen that a little practice is all that isrequired to interpret the photographic results, and to find outthe principal features of the country. But much depends onthe nature of the light, and this may tend to lead one Fig. 209/—Objects of different colours, photographed from above. Miethes system of colour photography is a further useful guide,which can hardly leave room for any doubt. It has been already stated that the use of yellow filters orisochromatic plates helps the photographic representation ofcolour to correspond more nearly to the impression produced onthe eye. In any case, marked differences of colour can generallybe understood, especially if the photograph is compared with , yellow, green, black, and the various shades of brownand grey are the most usual colours in a landscape; in towns, a THE INTERPRETATION OF PHOTOGRAPHS. 331 red tinge is added by the roofs. Photographs can be taken ofdifferent substances, such as leaves, sand, straw, water, earthysoil, etc., and if they are grouped together close to one another,the contrast of c
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Keywords: ., bookcentury1900, bookdecade1900, bookpubl, booksubjectaeronautics
