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Original Abbe apertometer, "made 1871"

Original Abbe apertometer, "made 1871"

1871
Slide case

Slide case

1900-1920
R. & J. Beck apertometer, 1860-1880

R. & J. Beck apertometer, 1860-1880

1860-1880
Apertometer, glass, made by R. & J. Beck Ltd.

Apertometer, glass, made by R. & J. Beck Ltd.

1948-1952
Very unusual apertometer microscope, made by R. & J. Beck for Woodward, with Abbe apertometers, English, late 19th century from theCrisp Collection

Very unusual apertometer microscope

1871-1900
Glass apertometers, Abbe-type, in mahogany box, German, second half of 19th century

Glass apertometers