Search Digital Records

• Format > composite photographs (remove)
• Subject > Learadio (remove)
• Subject > Lear Developments (remove)

Limit your search

• Still Image (2)

• composite photographs (2)
• photographic prints (2)

• Copyright undetermined (2)

• Aids to air navigation (2)
• Lear Developments (2)
• Learadio (2)
• Radio in aeronautics (2)
• Antennas (Electronics) (1)
• Radio--Transmitters and transmission (1)

2 results

[Learadio combination motor generator and transmitter] (Item)

Composite photograph of a Learadio combination motor generator and transmitter, showing views of the internal components and the external case, circa 1935-1937. The verso caption states that this was one of the first transmitting devices for private pilots. Typed caption on verso: "E. This is a combined motor generator and transmitter to operate on 3015 and 3120 KC. It was produced in quantities…

[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…