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Snell's Refractometer
OPTOMETRIC INSTRUMENTS
refractometer
Priest & Ashmore
Europe: United Kingdom, England, South Yorkshire, Sheffield
Late 19th c.
wood; ebony
1999.3030
OPTOMETRIC INSTRUMENTS
refractometer
Priest & Ashmore
Europe: United Kingdom, England, South Yorkshire, Sheffield
Late 19th c.
wood; ebony
Wooden refractometer bat containing sixteen round minus lenses from -0.5 to -8.0. Numbers marked in white. Fenestrated handle. Upper half held together with metal strips.
1999.3030
BOA Purchase, 1938