Search Digital Records

• Item Type > Still Image (remove)
• Subject > Learadio (remove)
• Rights > Copyright undetermined (remove)

Limit your search

• Still Image (38)

• United States (5)
• New York (N.Y.) (4)
• New York (State) (4)
• Washington (D.C.) (1)

• photographic prints (36)
• composite photographs (3)
• lithographs (1)
• maps (documents) (1)
• negatives (photographs) (1)

• Copyright undetermined (38)

• Learadio (38)
• Aids to air navigation (27)
• Radio in aeronautics (27)
• Lear Developments (17)
• Radio--Transmitters and transmission (13)
• Antennas (Electronics) (4)
• Radio direction finders (4)
• Airplanes, Company (3)
• Airplanes--Cockpits (3)
• Factories (3)
• Beech 17R Staggerwing (2)
• Airplanes, Military (1)
• Automatic pilot (Airplanes) (1)
• Beech B17L (SB17L) Staggerwing (1)
• Bolling Air Force Base (Washington, D.C.) (1)
• Commuter aircraft (1)
• Douglas C-47 Skytrain Family (1)
• Douglas DC-3 Family (1)
• Lear Avia Corporation (1)
• Lear, Inc. (1)
• Lear, William P. (William Powell), 1902-1978 (1)
• MacRobertson International Air Race (1934) (1)
• Nichols, Nichols, Reeder Glen, 1904-1975 (1)
• Pangborn, Clyde Edward, approximately 1893-1958 (1)
• Roosevelt Field (Airport : Garden City, N.Y.) (1)

38 results

[Learadio Model R-3 aircraft receiver, antenna, and peripheral components] (Item)

Photograph of a Learadio Model R-3 aircraft receiver, shielded loop antenna, and peripheral components, circa 1931-1939. The caption describes the device's development.Typed caption on verso: "P. This loop was metallized in an attempt to shield it, but it was found that the metallizing reduced the 'Q' of the loop so much that it was completely impractical. It was also used in conjunction with an…

[Learadio Model R1 receiver and headphones] (Item)

Photograph of a Learadio Model R1 receiver and headphones, circa 1931-1939. The device is on scale to demonstrate its light weight. The caption describes the device's development and specifications.Typed caption on verso: "C. A Model R-1 battery-operated receiver, which had very good sensitivity. As you can see, it weighs a little less than 16 1/2 lbs, complete with batteries and headphones. It is…

[Learadio T-30 and R-3 equipment] (Item)

Photograph of a Learadio T-30 R3 radio system and assorted components, circa 1935-1939. The inscription notes that this equipment was developed especially for pilots operating in Alaska.Inscription: "Learadio T-30 R3. Saved many lives and much money for bush pilots in Alaska and northern Canada. Designed in 1935 especially for Alaska flyers. / Trans. 2-freq. -- 3105 6210 and others. Plug-in…

[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."

[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 portable transceiver and travel case] (Item)

Photograph of a Learadio portable transceiver and travel case, circa 1931-1939.Inscription: "Portable transceiver for [illegible] use."

[Learadio loop antenna] (Item)

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