Louis Levin B-2 Drift Indicator

Weems and the famous air navigator Harold Gatty worked together to develop this new drift indicator. It could determine drift and ground speed without a cumbersome apparatus deployed outside the aircraft. 

Caption:
Early 1930s military version of the Gatty Drift Indicator.
Type: Artifact
Image Date: 2012
Credit: National Air and Space Museum, Smithsonian Institution
Origin: National Air and Space Museum, Smithsonian Institution
Creator: Eric Long
NASM2012-02186
Innovations
Navigation Methods
 
Early 1930s military version of the Gatty Drift Indicator.