Browse Items (90 total)

Items from Box 28, Folder 5 of the William P. and Moya Olsen Lear Papers, 1926-1941. Contains patent documentation for various aircraft and radio systems: Joseph Dugan's synchronous bomb sight, Dugan's radio direction and position indicating system,…

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.

Article written by William P. Lear about aircraft radio specifications for pursuit airplanes, circa late 1930s. 10 pages.

Photograph of a Learmatic navigator, circa 1940s.Inscription: "Learmatic navigator combining directional gyro with adjustable [illegible] and automatic and/or manual loop [rotator?]."

Photograph of a Learadio portable receiver, circa 1930s-1940s.Inscription: "Portable 2-band battery-operated receiver used thru-out WW2 by many USAF [personnel?] here and all over world."

Photograph of a Learadio Model RCB receiver tuning unit, circa 1930s-1940s.

Photograph of a Learadio radio compass tuning unit, circa 1930s-1940s.

Items from Box 4, Folder 30 of the William P. and Moya Olsen Lear Papers, circa 1931-1939. Contains two reports related to the Learadio Lear-O-Scope Model LC 100 Radio Compass Direction Finder.

Photograph of an aircraft instrument panel outfitted with Learadio equipment, circa 1931-1939. Two arrows point to the direction indicator and the interphone and radio transmit control switch.Inscription: "NA-44 / Learadio equipment installation /…

Photograph of an aircraft cockpit outfitted with Learadio equipment, circa 1931-1939. Arrows point to the microphone and support and the interphone and radio transmit control and jack box.Inscription: "NA-44 / Learadio equipment installation / Rear…