Sigma mechanical comparator fitted with a perspex

Made:
1940-1950 in Letchworth

Sigma mechanical comparator fitted with a perspex cover to reveal workings and with the original instrument cover; complete with an inspection fitting on the instrument platform; dated 1940 to 1950.

Details

Category:
Industrial Metrology
Object Number:
1973-404
type:
mechanical comparator
credit:
Herbert Controls & Instruments Ltd.
status:
Permanent collection

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