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Place
Material
Date
Spherometer, 3-legged type

Spherometer, 3-legged type

1875-1885
Spherometer by Philip Harris Ltd.

Spherometer by Philip Harris Ltd.

1943-1983
Spherometer and glass test plate in fitted wooden box

Spherometer and glass test plate in fitted wooden box

1870-1919
Spherometer

Spherometer

1920-1930
Spherometer in fitted case

Spherometer in fitted case

1875-1918
Spherometer

Spherometer

1920-1930
Spherometer

Spherometer

1950-1975
Spherometer

Spherometer

1920-1930
Spherometer, calibrated in dioptres

Spherometer, calibrated in dioptres

1900-1949
Spherometer in box with accessories

Spherometer in box with accessories

Spherometer, reads to 1/10

Spherometer, reads to 1/10

1845-1855
Spherometer, 1891

Spherometer, 1891

1891
Spherometer

Spherometer

1950-1975
Three microspherometers plus box of wire

Three microspherometers plus box of wire

'Spherometre' a type of sperometer used to measure the convex and concave shape of spectacle ophthalmic lenses, signed 'G. L.', French, 1900-1920. Dial scale graduated in dioptres (dioptrice) & inches (pouce) and marked as patented (Brevete S.G.D.G.).

Spectacle lens measuring instrument

1900-1920
Spherometer (1-inch radius) with case, made by A. Hilger, London, England, 1891.

Spherometer (1-inch radius) with case

1891
Sphermometer made by Harvey & Peak, London, c.1900.

Sphermometer made by Harvey & Peak

circa 1900