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 204
the gas can freelyescape. A Frenchman, named Mallet, devised an arrangementby which air is prevented from being sucked into the balloon,and used it on one of his expeditions with success. He remainedin the air for 36J hours, and covered a distance of 560 miles.The neck is joined to the ring by… … At the top of the balloon is placed the valve, which is either inthe form of a disc or of the butterfly type. Strong springs areused to close it after it has been opened for any purpose, and thevalve is made tight by pressing its sharp edge against a rubberseating. It wasthe general cus-tom, years…
Aeronautics
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