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
ideration, as compared with those based uponthe assumption of uniform sensitivity throughout the visiblespectrum. 17 In the above questions it has been tacitly assumed that the sun is the source of illumination. Suppose a searchhght is to beused at night. In what part of the spectrum will the… … 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.)
Physics · Military art and science
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