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Photograph of a TWA Douglas DC-1 aircraft (tail and wing number NR223Y) at an airfield, circa 1935-1938. A man in a TWA jumpsuit stands near the aircraft. The caption notes that this aircraft was outfitted with a Model L Learscope during its record-setting coast-to-coast flight on April 30, 1935.Typed caption on verso: "A. This was an experimental installation of a Model L Learscope on a TWA…
Pamphlet about Learadio aircraft radio equipment, circa 1930s. Contains technical specifications and images of various models of transmitters, receivers, power supplies, and accessories. 41 pages.
Items from Box 4, Folder 6 of the William P. and Moya Olsen Lear Papers, September to October 1939. Folder contains assorted items related to the Learadio Airport Localizer (L-P-2), including summaries, correspondence, diagrams, sketches, a clipping, and a Library of Congress certificate of copyright. 14 total documents and original folder labeled "L-p2 / 'Learadio Airport Localizer.'"