Problems in physics. Derived from military situations and experience (1919)
United States. War Dept. Committee on education and special training, Dodge, Homer Levi, 1887- · [Washington? · leaf 160
Figure 1. Area near Langley Field. Va. Photographed with an ordinary plate, with no filter.(Exposure 1/340 second; altitude 5,500 feet. Low altitude gives an ad-vantage over plate used for photograph below.) … Figure 2. Same area photographed with a s;:ecial American Panchro-matic plate, using a red filter.(Exposure 1/30 second; altitude 10,003 feet.) RAY FILTERS 131 19. What are the optical characteristics of a ray filter to be used when viewing a distant object illuminated by a searchlight? 20. How…
Physics · Military art and science
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