Search Digital Records

• Subject > Aids to air navigation (remove)
• Item Type > Still Image (remove)
• Rights > Copyright undetermined (remove)

Limit your search

• Still Image (41)

• photographic prints (41)
• composite photographs (4)

• Copyright undetermined (41)

• Aids to air navigation (41)
• Radio in aeronautics (34)
• Learadio (27)
• Lear Developments (20)
• Radio--Transmitters and transmission (16)
• Antennas (Electronics) (5)
• Automatic pilot (Airplanes) (5)
• Lear, Inc. (5)
• Radio direction finders (4)
• Airplanes--Cockpits (3)
• Fisher, Herbert O. (3)
• Lear Avia Corporation (3)
• Lear, William P. (William Powell), 1902-1978 (3)
• Canada. Royal Canadian Air Force (1)
• Douglas DC-3 Family (1)
• MacRobertson International Air Race (1934) (1)
• Nichols, Nichols, Reeder Glen, 1904-1975 (1)
• Ontario. Department of Lands and Forests. Forestry Branch (1)
• Pangborn, Clyde Edward, approximately 1893-1958 (1)
• Turner, Roscoe, 1895-1970 (1)
• United States. Army. Signal Corps (1)

41 results

[Learadio remote controller and transmitter remote control] (Item)

Photograph of a Learadio remote controller and transmitter remote control, circa 1936. The caption describes the devices' specifications and utility.Typed caption on verso: "O. (circa 1936) A picture of both the combination remote controller and the transmitter remote control. You will note there were blank spaces on the transmitter selector dial to write in the particular frequencies of the…

[Learadio loop antenna] (Item)

Composite photograph of a Learadio loop antenna, showing two views of the internal components, circa 1931-1939. The caption describes the antenna's development and specifications.Typed caption on verso: "H. Shows an early attempt to tune the loop antenna at the antenna, itself, to eliminate the losses attendant to a long loop line. Also you will note that there were two loops in the fore and aft…

[Man using Learadio portable marker transmitter] (Item)

Photograph of a man using a Learadio portable marker transmitter in an open field, circa 1931-1939.Inscription: "First completely portable outer or inner marker transmitter for radio compass [illegible]."

[Learadio antenna reel] (Item)

Photograph of a Learadio antenna reel, circa 1939.Inscription: "Complete manual operated ant. reel with spring take-up fair-lead and [illegible]. / 1939."

[Learadio loop antenna] (Item)

Photograph of a Learadio loop antenna, circa 1931-1939.

[Aircraft instrument panel equipped with Lear, Incorporated VHF receiver and orienter] (Item)

Photograph of an aircraft instrument panel equipped with a Lear, Incorporated VHF receiver and orienter, circa 1940s.Inscription on verso: "Lear Avionics installation late 30's - early 40's."Stamped on verso: "Please return to: Lear Archive, [address and telephone number in Reno, Nevada]."

[Douglas DC-3 instrument panel with Learadio ADF 8] (Item)

Photograph of a Douglas DC-3 instrument panel with a Learadio ADF 8 automatic direction finder, circa 1940s. The direction finder and two gauges are circled and numbered. Inscription on verso: "Copy of instrument panel (Chicago and [illegible] DC-3)."

[Aircraft instrument panel equipped with Learadio device] (Item)

Photograph of an aircraft instrument panel equipped with a Learadio device, circa 1941.Inscription: "1941. [Amphibian?] with first dry-cell operated trans-rec[cut off]. [illegible] watt. Range 300 miles."

[Learadio Model RCB receiver tuning unit] (Item)

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

[Learadio radio compass tuning unit] (Item)

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