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Snell's Refractometer
OPTOMETRIC INSTRUMENTS
refractometer
Priest & Ashmore
Europe: United Kingdom, England, South Yorkshire, Sheffield
Late 19th c.
wood; ebony
1999.3031
OPTOMETRIC INSTRUMENTS
refractometer
Priest & Ashmore
Europe: United Kingdom, England, South Yorkshire, Sheffield
Late 19th c.
wood; ebony
Wooden refractometer bat containing sixteen round plus lenses from +0.5 to +8.0. Numbers marked in red. Fenestrated handle.
1999.3031
BOA Purchase, 1938