Refractometer(?), vulcanite frame, in leather purs

Made:
1880-1910 in France
Refractometer(?), vulcanite frame, in leather purse, French

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Refractometer(?), vulcanite frame, in leather purse, French
Science Museum Group
The Board of Trustees of the Science Museum

Refractometer(?), vulcanite frame, in leather purse, French, 1880-1910