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 361
the object. But eventhis is not so important as might be thought. If the balloon is moving very fast it is often impossible tomake the second exposure at the right distance from the first.The best plan is therefore to have two cameras, fastened to thesame baseboard. The plates in each are prepared… … Fig. 211. -Boulades stereoscopic camera distance of 1,000 yards, and the balloon is moving at the rate of10 yards per second, the second exposure must be made betweenone and three seconds after the first. If no great plastic effect is required, and the objects are not inthe far distance, an…
Aeronautics
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