Drift Meter B3 Boeing B17D Swoose. Sighting head, missing periscopic B-3 was used on bombers and transports when ground or water could be clearly seen. It evolved from the earlier Gatty drift meters.

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Size: 1394px × 1792px
Photo credit: © SBS Eclectic Images / Alamy / Afripics
License: Licensed
Model Released: No

Keywords: aeronautics