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Bishop Harman's Refractometer
OPTOMETRIC INSTRUMENTS
refractometer
c.1905
metal

Two lens discs joined on a hinged bracket. Black metal. Each disc has six round lenses (one disc positive, one disc negative) and two ancillary lenses on a fold-down mount behind. Plus lenses marked in red, minus lenses marked in white.


1999.3063

Gift of Mr G.W. Colebrook, 1954



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