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Show Lieutenants Macready and Stevens of the army air service ascended In an airplane 32,220 feet above Dayton, Ohio, a few weeks ago. At that height the airplane was invisible from the ground. When they looked down the city was obscured by a blue haze. Yet they snapped their camera several times and obtained remarkable photographs photo-graphs of the city pictures in which the buildings, even the automobiles in the streets, were defined clearly. That they were able to make pictures of objects ob-jects Invisible to them was due to three factors an extra-long-focus camera, super-speed film and a "minus blue" ray filter that absorbed tho ground haze. No aerial photograph ever before had been made from such a height as six miles. |