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 216
e. Things are somewhatdifferent with a captive balloon, which is often left in the inflated INSTRUMENTS. 195 state for several days, in order to save expense; when at last itno longer has sufficient lift, it is emptied and refilled. Lebaudysmotor-balloon worked for several months with one filling… … Fig. 122.—Microphotoscope in case. is to open the valve, or to raise the mouth of the neck. Thekite-balloon is emptied through a special opening towards theback at the top. The ripping-panel must of course be very[care-fully cemented down after use, and this ought to be done notmore than three days…
Aeronautics
Internet Archive · Library of Congress · Public Domain Mark 1.0. Free to use for anything.
