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 200
be its capacity, and, of course, with hydrogen, muchgreater heights can be reached than with coal gas. If longjourneys are to be undertaken, large balloons are necessary.This arises from the fact that leakage is continually occurring,and it must be possible to neutralise this by throwing out… … Fig. 107—Sectionthrough steelcylinder. 180 AIKSHIPS PAST AND PRESENT. numerous. Dirigible balloons may have a framework of alu-minium sheets, but it is better to use some kind of wovenmaterial. Paper and rubber are only used for pilot balloons;they are also useful for meteorological purposes, and…
Aeronautics
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