This object is not on display at the National Air and Space Museum, it is either on loan or in storage.
Transferred from the Department of Commerce, Bureau of Standards
Country of Origin: United States of America
3-D Test: 3.7 x 15.8cm (1 7/16 x 6 1/4 in.)
Physical Description:Diam 158mm, h 37mm; experimental; pendulum operated
Inventory number: A19570540000