Browse Items (90 total)

[Betsy Ross using Learadio portable receiver]
Photograph of pilot Betsy Ross using a Learadio portable receiver in the cockpit of her Taylorcraft aircraft, August 20, 1940. An accompanying press release describes Ross's recent flight from Harrisburg Pennsylvania State Airport, noted as the first…

Learadio notes on direction finding!
Notes written by William P. Lear about the utility of automatic direction finders, circa 1940. Describes a flight from New York to Dayon, Ohio in Lear's Waco aircraft and how a Lear ADF-8 helped him navigate despite static from a thunderstorm.…

[Learadio automatic direction finder]
Photograph of a Learadio automatic direction finder, circa 1940.Inscription: "Manual loop antenna rotator and directional indicator. 1940."

[Lear Developments BC-190-T5 radio transmitter]
Photograph of a Lear Developments BC-190-T5 radio transmitter, circa 1940. The verso inscription notes that this transmitter was developed for the U.S. Army Signal Corps and describes the device's components and specifications.Inscription on verso:…

[William P. and Moya Olsen Lear Papers, Box 27, Folder 34; Box 200, Folder 3 - Assorted ad sheets and brochures for various Lear Avia products [RM files], undated (circa 1939-1944)]
Items from Box 27, Folder 34 and Box 200, Folder 3 of the William P. and Moya Olsen Lear Papers, circa 1939-1944. Contains assorted ad sheets and brochures for various Lear Avia products. 18 total items.

[William P. and Moya Olsen Lear Papers, Box 26, Folder 9 - "Learmatic (L-P-3) and Learmatic gyromatic radio compass," undated (circa 1939-1944)]
Items from Box 26, Folder 9 of the William P. and Moya Olsen Lear Papers, circa 1939-1944. Contains a hand-drawn sketch, diagrams, and documents related to the Learmatic and Learmatic Gyromatic Radio Compass. Six total documents.

[William P. and Moya Olsen Lear Papers, Box 4, Folder 23; Box 200, Folder 1; Box 209, Folder 1 - ADF-6 and ADF-7 -- notes and diagrams [RM files], 1939 February - 1940 March]
Items from Box 4, Folder 23; Box 200, Folder 1; and Box 209, Folder 1 of the William P. and Moya Olsen Lear Papers, February 1939 to March 1940. Contains notes and diagrams related to ADF-6 and ADF-7 automatic direction finders. 11 total items.

[William P. and Moya Olsen Lear Papers, Box 34, Folder 1 - "Lear low approach system (31-1 and 31-3)," 1939 December]
Items from Box 34, Folder 1 of the William P. and Moya Olsen Lear Papers, December 1939. Contains handwritten notes and sketches about the Lear low approach system. All or most of the notes appear to have been written by William P. Lear. Five total…

[William P. and Moya Olsen Lear Papers, Box 4, Folder 27 - "Blind approach by voice," 1939 August]
Items from Box 4, Folder 27 of the William P. and Moya Olsen Lear Papers, August 1939. Includes eight pages of handwritten notes and sketches related to "Blind approach by voice," an airplane landing system.

Learadio automatic landing field orientation device
Report about the Lear Developments automatic landing field orientation device, June 1939. Contains technical details about the device. Three typed pages on Learadio letterhead.
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