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 166
t,and the result of their firing was to drive the French to starttheir balloons by night. The German artillery knew the diameter of these balloons to BALLOONING IN THE FRANCO-PRUSSIAN WAR. 145 be 50 ft., and were therefore able to tell the distance approxi-mately. In this connection it may be well… … Fig. 89.—Gun constructed by Krupp for firing at balloons. estimated if the size is known. In that case it must be examinedthrough a telescope provided with spider lines, and the angleat which a non-spherical balloon would be standing mustbe taken into account. For instance, a French…
Aeronautics
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