Early example of a Sigma mechanical comparator

Made:
circa 1940 in Letchworth

Early example of a Sigma mechanical comparator with workings visible. Made 1945-1955

Details

Category:
Industrial Metrology
Object Number:
1993-1532
Materials:
steel
Measurements:
overall: 23.622 x 7.874 x 9.0551 in.; 60 x 20 x 23 cm
type:
mechanical comparator
credit:
Royal Military College of Science