CCO - Creative Commons (CC0 1.0) This media is in the public domain (free of copyright restrictions). You can copy, modify, and distribute this work without contacting the Smithsonian. For more information, visit the Smithsonian's Terms of Use page. IIIF provides researchers rich metadata and image viewing options for comparison of works across cultural heritage collections. More - https://iiif.si.edu View Manifest View in Mirador Viewer CCO - Creative Commons (CC0 1.0) This media is in the public domain (free of copyright restrictions). You can copy, modify, and distribute this work without contacting the Smithsonian. For more information, visit the Smithsonian's Terms of Use page. IIIF provides researchers rich metadata and image viewing options for comparison of works across cultural heritage collections. More - https://iiif.si.edu View Manifest View in Mirador Viewer CCO - Creative Commons (CC0 1.0) This media is in the public domain (free of copyright restrictions). You can copy, modify, and distribute this work without contacting the Smithsonian. For more information, visit the Smithsonian's Terms of Use page. IIIF provides researchers rich metadata and image viewing options for comparison of works across cultural heritage collections. More - https://iiif.si.edu View Manifest View in Mirador Viewer CCO - Creative Commons (CC0 1.0) This media is in the public domain (free of copyright restrictions). You can copy, modify, and distribute this work without contacting the Smithsonian. For more information, visit the Smithsonian's Terms of Use page. IIIF provides researchers rich metadata and image viewing options for comparison of works across cultural heritage collections. More - https://iiif.si.edu View Manifest View in Mirador Viewer

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.

 Display Status

This object is not on display at the National Air and Space Museum. It is either on loan or in storage.
Object Details
Country of Origin United States of America Type INSTRUMENTS-Navigational Physical Description Sighting head, missing periscopic element. Dimensions 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.)
 Materials Aluminum, brass, copper, cork, glass mirror, lenses, paint, plastic
 Inventory Number A19500075025 Credit Line Gift of the City of Los Angeles Data Source National Air and Space Museum Restrictions & Rights Open Access (CCO)
For more information, visit the Smithsonians Terms of Use.