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In 1916, Northey showed how to calculate the angle of view using ordinary carpenter's tools. [2] The angle that he labels as the angle of view is the half-angle or "the angle that a straight line would take from the extreme outside of the field of view to the center of the lens;" he notes that manufacturers of lenses use twice this angle.
The location had been promoted by real estate agent William W. Mines, and Mines Field as it was known had already been selected to host the 1928 National Air Races. On August 13, 1928 the city leased the land and the newly formed Department of Airports began converting the fields, once used to grow wheat , barley , and lima beans , into dirt ...