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 363
e,pointing vertically downwards. The other six were arranged atthe corners of a regular hexagon, pointing downwards at anangle of 10° to the horizontal. His first attempts were not verysuccessful. At last he completed his arrangements, but it wasthen found that the plan was not altogether suitable.…
Aeronautics
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