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 83
the gas-bags and the outercovering, and served to protect them from undesirable variations 62 AIKSHIPS PAST AND PEESENT. of temperature. This is a matter of great importance, becausethe indirect effect of radiation would otherwise be to cause a riseor fall. The first ascent was made in July, 1900,… … Fig. 32.—Count Zeppelins dirigible balloon. so bent that the propellers could not be properly worked. Con-sequently full speed could not be reached, the maximum thatwas actually attained being 13 ft. per second, and it was alsoimpossible to steer, as the ropes that were used for this purposebecame…
Aeronautics
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