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• Subject > Aids to air navigation (remove)

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20 results

[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…

Gyroscope/Lear Attitude Gyro, Model 974R-1 (Item)

The gyroscope is constructed out of black metal with a glass face for the front dial. There is a black label on bottom portion of the glass with the white text, "Lear Attitude Gyro Model 974R-1." The metal is cylindrical with pieces screwed together. The base has two circular openings with the text "Air Inlet" in high relief underneath. There is a short brown plastic wire with a black and silver…

[Learadio Model RCB receiver tuning unit] (Item)

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

[Brochure for Learadio Model T30-R3AB aircraft transmitter-receiver] (Item)

Brochure for the Learadio Model T30-R3AB aircraft transmitter-receiver, circa 1939.

[Brochure for Learadio Model UT-6 radio transmitter] (Item)

Brochure for the Learadio Model UT-6 radio transmitter, circa 1939.

[Chassis of Model L Lear-o-Scope] (Item)

Photograph of the chassis of a Model L Lear-o-Scope, circa 1931-1939. The verso inscription, which was written by William P. Lear, describes the development of the device.Inscription on verso: "Here is chassis of Model L Lear-o-Scope. The layout was done by WPL -- Wilbur Webb - now deceased who left me and went to Bendix - and Fred [Coombs?] who could layout and draw up such a unit in a maximum of…

[Model L Lear-o-Scope and loop antenna] (Item)

Photograph of a Model L Lear-o-Scope and loop antenna, circa 1936-1939. The verso inscription, which was written by William P. Lear, describes the device and its development.Inscription on verso: "Note left crank changed bands and moved mash on dial -- Right crank for tuning -- moved freq. dial 200 to 410 KC -- 530 to 1530 KC. Also first time tuning meter used. High Z loop with short tuning coil…

[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…

Gyroscope/Rate Integrating Gyro, Floating, Model 1078A (Item)

Rate Integrating Gyroscope made out of metal and steel. The object is cylindrical with a thick silver steel band around the center circumference. The base of the object is circular silver metal and small copper colored prongs. The main body of the object has a texturized finish. The object was adhered to a square base but is no longer attached. There is a note with information about the object…

Finder, Direction/Automatic Direction Finder, Model 5512A (Item)

Automatic Direct Finder constructed out of gray and silver metal. The object is a rectangular form with two main components screwed together. The top portion has vents on each of the four sides and the bottom portion has circle cutouts on two of the four sides. On the front of the finer is the circular connecter component. There is a black and silver plate adhered to the bottom left corner of the…