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Micrometer for petrological sections

1890-1900

Stage micrometer by W. Watson and Sons Ltd.

1871-1900

Micrometer, possibly for measuring lenses

1850-1940

Eyepiece micrometer

1890-1900

Micrometer, possibly for measuring lenses

1850-1940

Stage micrometer by R. & J. Beck Ltd.

1950-1970
Two centimetre dental amalgam micrometer, in case, U.S.A., 1880-1914

Two centimetre dental amalgam micrometer

1880-1914
Boys radio-micrometer made in 1907 by, The Cambridge Scientific Instrument Co. Ltd., Cambridge, England, no.5426 with wooden box (sighting tube and several nuts missing)

C V Boys' radio-micrometer, with outer casing removed, 1907.

1907