Airships past and present, together with chapters on the use of balloons in connection with meteorology, photography and the carrier pigeon . Fig-. 181.—Triboulets panoramic apparatus.(From La Pliotograpliie en Ballon, by Tissandier. BALLOON PHOTOGRAPHY. 289 modern improvements in the art of constructing lenses, whichare now made of great focal lengths. In 1885 Tissandier andDucom employed one having a focal length of 22 in., and thisprobably represents the furthest limit likely to be reached bythe amateur. Cailletet has devised an arrangement for registering theheights reached in a balloon wh
Airships past and present, together with chapters on the use of balloons in connection with meteorology, photography and the carrier pigeon . Fig-. 181.—Triboulets panoramic apparatus.(From La Pliotograpliie en Ballon, by Tissandier. BALLOON PHOTOGRAPHY. 289 modern improvements in the art of constructing lenses, whichare now made of great focal lengths. In 1885 Tissandier andDucom employed one having a focal length of 22 in., and thisprobably represents the furthest limit likely to be reached bythe amateur. Cailletet has devised an arrangement for registering theheights reached in a balloon which does not carry observers. Acamera is carried which has two lenses, both of which project. Fig. 1S2.—The first photograph taken from a balloon in Austria. It representsthe Reichsbriicke in Vienna, and was taken by Viktor Silberer in 1885. their images on the same plate. One of these lenses is focussedon an aneroid barometer, and the other takes the view of thelandscape in the usual way. By means of a piece of clockworkexposures are made at certain intervals, and fresh films areautomatically rolled into position. The film therefore recordsthe reading of the barometer as well as the view of the had a method of checking the readings of the barometerby comparing the known distances between two places, asmeasured on the ordnance map, with their apparent distanceas measured on the photograph. The focal length of the lensa. u 290 AIKSHIPS PAST AND PEE SENT. being known, it was possible in this way to calculate the heightof the balloon. He also devised an apparatus with nine lenses
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