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[William P. and Moya Olsen Lear Papers, Box 4, Folder 30 - "Descriptive specifications of Learadio Lear-O-Scope Model LC 100 Radio Compass Direction Finder," circa 1931-1939] (Item)

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.

[William P. and Moya Olsen Lear Papers, Box 4, Folder 27 - "Blind approach by voice," 1939 August] (Item)

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.

[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] (Item)

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.

[Lear Developments BC-190-T5 radio transmitter] (Item)

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: "45 kc to 13 mc 50 watt trans. 4 [illegible] and master osc [oscillator]. Designed about 1940 in Vandalia for first AC operated aircraft of Signal…

[Lear Developments Type T-120 transmitter] (Item)

Photograph of a Lear Developments Type T-120 transmitter, circa 1936-1939. The caption on verso notes that transmitter was developed for the Royal Canadian Air Force and describes the device's components and specifications. Caption on verso: "J. This transmitter/receiver combination was designed for the Canadian RAF and called the Type T-120, built around 1936-37 and was essentially an R3 receiver…

[Lear radio compass] (Item)

Photograph of a Lear radio compass, circa 1931-1939.

[Lear Developments telephone transmitter] (Item)

Composite photograph of a Lear Developments telephone transmitter, showing views of the internal components and the external case, circa 1931-1939. The verso inscription, which was written by William P. Lear, states that this was the first 3105-3120 kc 35-watt telephone transmitter made for private pilots.Inscription on verso: "The first 3105-3120 KC 35 watt telephone transmitter ever made for…

[Lear Developments special aircraft receiver and remote control unit] (Item)

Photograph of a Lear Developments special aircraft receiver and remote control unit (radio transmitter Type L-35S-1), circa 1931-1939. The verso caption notes that the receiver was developed for the Ontario Forestry Branch and describes the device's components and specifications. Typed caption on verso: "V. The control head for the Ontario Forestry Branch of the Dept. of Lands and Forests of…

[Learadio combination motor generator and transmitter] (Item)

Composite photograph of a Learadio combination motor generator and transmitter, showing views of the internal components and the external case, circa 1935-1937. The verso caption states that this was one of the first transmitting devices for private pilots. Typed caption on verso: "E. This is a combined motor generator and transmitter to operate on 3015 and 3120 KC. It was produced in quantities…

[Various components for Learadio T30R3 installation] (Item)

Photograph of various components for a Learadio T30R3 installation, circa 1931-1939. The verso caption describes the problems and capabilities of the trailing antenna.Typed caption on verso: "G. Shows a complete set of equipment for a T30R3 installation. You will note that the antenna consisting of a trailing rope that was always hanging out of the airplane without a weight on it, and the big…

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