Airships past and present, together with chapters on the use of balloons in connection with meteorology, photography and the carrier pigeon . 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 and not less than one day before makinga fresh start. If it is left for a longer time, it often sticks so fast. Fig. 123.—Microphotoscope, with magnifying gla
Airships past and present, together with chapters on the use of balloons in connection with meteorology, photography and the carrier pigeon . 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 and not less than one day before makinga fresh start. If it is left for a longer time, it often sticks so fast. 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 benzine contained in therubber solution is not allowed to evaporate sufficiently beforeputting the piece in position on the covering. The examination of the envelope on the inside is carried out o 2 196 AIRSHIPS PAST AND PRESENT. by several persons, after it has been filled with air. The mostminute leaks can easily be detected; the light which passesthrough them draws attention to their existence, even though itis impossible to see any trace of a hole on the outside. All suchholes must be patched both on the outside and inside. Rentsare first sewn together and then patched, and any kind of injurymust be made good by covering with fresh material. With kite-balloons it is necessary to see to t
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Keywords: ., bookcentury1900, bookdecade1900, bookpubl, booksubjectaeronautics
