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• Subject > Aids to air navigation (remove)

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• Still Image (63)

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• photographic prints (56)
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• Aids to air navigation (63)
• Radio in aeronautics (41)
• Learadio (35)
• Lear Developments (22)
• Radio--Transmitters and transmission (16)
• Automatic pilot (Airplanes) (11)
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• Lear, Inc. (8)
• Lear, William P. (William Powell), 1902-1978 (7)
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• Fisher, Herbert O. (3)
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• MacRobertson International Air Race (1934) (1)
• Nichols, Nichols, Reeder Glen, 1904-1975 (1)
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63 results

[Aircraft instrument panel outfitted with Learadio equipment] (Item)

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 / Front cockpit. 20.1171/33."

[Aircraft cockpit outfitted with Learadio equipment] (Item)

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 cockpit. 20.1171/33."

[Aircraft instrument panel outfitted with Learadio equipment] (Item)

Photograph of an aircraft instrument panel outfitted with Learadio equipment, circa 1931-1939.

[Learadio radio and navigation equipment] (Item)

Photograph of Learadio radio and navigation equipment, consisting of a transmitter, receiver, and direction finder, circa 1936-1939. The verso caption notes that this equipment was developed by "myself" (William P. Lear) and Reeder Nichols for the London to Melbourne Air Race.Caption on verso: "S. This is the equipment that was built up in the 60 days in our organization at 123 W. 17th St. NYC, by…

[Lear Developments aircraft transmitter] (Item)

Photograph of a Lear Developments aircraft transmitter, circa 1931-1939. The verso caption notes that this transmitter was developed for the Flight International Corporation and describes the device's components and specifications.Typed caption on verso: "K. This is an aircraft transmitter designed for International Flight Corporation and was the first transmitter, I believe, that was ever…

[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…

[Learadio airport telephone transmitter] (Item)

Photograph of a Learadio airport telephone transmitter, circa 1931-1939. Inscription: "This 15-watt power transmitter was habitually able to work aircraft 250 miles away. Freq. 278 kc."

[Learadio R3AB receiver] (Item)

Photograph of a Learadio R3AB receiver, circa 1937-1939. Inscription: "Ground station designed for foreign use 1937-193[cut off]."

[Learadio T-40 transmitter] (Item)

Photograph of a Learadio T-40 transmitter, circa 1935-1939. Inscription: "T40 6 freq. transmitter designed for D.O.C. (FAA). 1935."