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Abbe Refractometer, about 1956

1956
Prestwich fluid gauge comparator, c1917.

Prestwich fluid gauge comparator, c1917.

1916-1919
Sigma Instruments thickness gauge, 1951 stored in a box and fitted with a inspection fitting for measuring screw thread acceptibility. Purchased from Plessey Records in 1951.

Sigma Instruments thickness gauge

1951
Optical lever type workshop comparator measuring machine, with extra daylight projector giving a 1000 : 1 magnification at the scale.

Optical lever type workshop comparator measuring machine

circa 1920
Tomlinson surface finish analyser, made by Baty & Co.1951.

Tomlinson surface finish analyser

1939-1951