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
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… … Fig. 123.—Microphotoscope, with magnifying glass for use in daylight. that it requires the efforts of several persons to pull it apartagain, and in rough weather this may easily cause a great dealof unpleasant bumping. The opposite happens if the patchisclosed too soon before starting, or if the…
Aeronautics
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