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Raphael's Patent Opsiometer
OPTOMETRIC INSTRUMENTS
refracting unit
J. Raphael & Co
Europe: United Kingdom, England, London
c.1891
mahogany; glass
overall: 310 x 240 x 215 mm

Opsiometer consisting of two rolls of fabric-mounted oval lenses fixed inside mahogany case. Front slides open and features apertures for eyes, nose and for viewing lens numbers. Two sets of stained control knobs at either side. Fixed internal shutter. Fold-out target holder at rear with test-type card. Brass stay. Green manufacturer's label.


2000.22

College Purchase, 2000



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