Search Digital Records

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

Limit your search

• Still Image (31)

• New York (N.Y.) (3)
• New York (State) (3)
• United States (3)

• photographic prints (31)
• composite photographs (4)

• Copyright undetermined (31)

• Lear Developments (31)
• Radio in aeronautics (23)
• Aids to air navigation (20)
• Learadio (17)
• Radio--Transmitters and transmission (10)
• Antennas (Electronics) (7)
• Factories (3)
• Canada. Royal Canadian Air Force (1)
• Commuter aircraft (1)
• Douglas DC-1 (1)
• Ontario. Department of Lands and Forests. Forestry Branch (1)
• Radio (1)
• Trans World Airlines (1)
• Transport planes (1)
• United States. Army. Signal Corps (1)
• United States. Department of Commerce (1)

31 results

[Lear Developments loop antenna] (Item)

Photograph of a Lear Developments loop antenna with a transparent plastic shield, circa 1935-1939.Inscription on verso: "Loop antenna. Winner of national plastics award in 1935. First stream lined housing for loop antennae."Stamped on verso: "Please credit Hans Groenhoff."

[Men working with Lear devices and a loop antenna] (Item)

Photograph of three men working with Lear devices and a loop antenna, circa 1931-1939.

[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.

[People working in Lear Developments workshop] (Item)

Photograph of people working in the Lear Developments workshop, New York City, New York, circa 1933-1938. Electronic components, device casings, and a loop antenna are visible on the workbenches.Inscription on verso: "The Lear (1) Engineering Dept, (2) Lear Laboratory, (3) Complete stock of test apparatus and inventory, (4) 1/2 floor #4 125 W 17th St NYC. (Associated with Fred M. Link 1933-1938.)"

[People working in Lear Developments workshop] (Item)

Photograph of people working in the Lear Developments workshop, New York City, New York, circa 1933-1938. Machine tools and device casings are visible on the workbenches.