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• Subject > Aids to air navigation (remove)

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20 results

[Learadio aircraft communications system] (Item)

Photograph of a Learadio aircraft communications system, circa 1931-1939. Specific devices pictured include the Model MOPA transmitter (emitator acord unit) and Model R2BB receiver (receptive accord unit).Caption: "Typical aircraft communication system."

[William P. Lear with Lear-o-Scope and loop antenna] (Item)

Photograph of William P. Lear with a Lear-o-Scope and loop antenna, New York City, New York, circa 1935. Inscription on verso: "Bill Lear and his first direction finder, the Lear-o-Scope. NCY. 1935. Courtesy Lear Archives."Typed caption on verso: "Q. Here yours truly is looking through the loop antenna that was finally adopted for the Model L Learscope. It is interesting to note that the Model L…

[Assorted Learadio devices] (Item)

Photograph of assorted Learadio devices, circa 1935. Pictured devices include the Model R-3 aircraft receiver, T-30 radio unit, and a shieled loop antenna.Inscription on verso: "Lear equip / circa 1935."

[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.

Learadio aircraft radio equipment [pamphlet] (Item)

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.

[William P. and Moya Olsen Lear Papers, Box 21, Folder 7; Box 207, Folder 2; Box 209, Folder 4 - "Leartron control system" [L-D-101], 1943 February - 1944 February] (Item)

Items from Box 21, Folder 7; Box 207, Folder 2; and Box 209, Folder 4 of the William P. and Moya Olsen Lear Papers, February 1943 to February 1944. Contains correspondence, diagrams, notes, photographs, and sketches related to the Leartron control system. 29 total items and original folder labeled "Leartron control system / L-D-101."

[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)] (Item)

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 27, Folder 28 - "Aircraft electric remote control actuators and automatic controls," 1944 March 29] (Item)

Items from Box 27, Folder 28 of the William P. and Moya Olsen Lear Papers, March 29, 1944. Contains a paper titled "Aircraft electric remote control actuators and automatic controls," written by William P. Lear for a joint meeting of the Franklin Institute and American Institution of Electrical Engineers (Philadelphia Section). A partial draft is also included, containing handwritten edits. Two…

[William P. and Moya Olsen Lear Papers, Box 50, Folder 11 - "Aviation radio before, during, and after the war" -- WPL speech, 1945 March 7] (Item)

Items from Box 50, Folder 11 of the William P. and Moya Olsen Lear Papers, March 7, 1945. Contains a typed copy of speech delivered by William P. Lear to the Aviation Writers Association and booklet with a slightly edited version of the speech. The speech focuses on Lear's ongoing development of aviation radio devices. Two total documents.

[William P. and Moya Olsen Lear Papers, Box 18, Folder 1 - "Radio automatic guidance system (Case 31-3) and loop antenna system (Can 8-1)," 1940-1943] (Item)

Items from Box 18, Folder 1 of the William P. and Moya Olsen Lear Papers, circa 1940-1943. Contains a patent application and other documents related to the Radio Automatic Guidance System (Case 31-3) and Loop Antenna System (Can. 8-1), as well as a manual titled "The Lear-Matic: The ultimate instrument for aircraft navigation." 15 total documents.