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The B-3 was used on bombers and transports when ground or water could be clearly seen. It evolved from the earlier Gatty drift meters.
This object is not on display at the National Air and Space Museum. It is either on loan or in storage.
United States of America
INSTRUMENTS-Navigational
Sighting head, missing periscopic element.
3-D (Without Eyepiece): 26.7 x 15.2 x 22.2cm (10 1/2 x 6 x 8 3/4 in.)Other (With Eyepiece): 26.7cm (10 1/2 in.)
Aluminum, brass, copper, cork, glass mirror, lenses, paint, plastic
A19500075025
Gift of the City of Los Angeles
National Air and Space Museum
Open Access (CCO)For more information, visit the Smithsonian’s Terms of Use.