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 57
Fig. 17.—The statoscope, byGradenwitz. 36 A1KSHIPS PAST AND PRESENT. … THE THEORY OF THE BALLOON. 37 following simple method. Three different kinds of colouredpapers are torn up into small pieces, the various papers havingdifferent thicknesses. Consequently each piece of paper beginsto fall at a particular rate, which is known by its colour. Forinstance, let us…
Aeronautics
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