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crossed cylinder confirmation test
OPTOMETRIC INSTRUMENTS
crossed cylinder
Europe: United Kingdom
mid 20th c.
metal; glass
each lens: 35 mm; overall: 182 mm x 42 mm
2022.167
OPTOMETRIC INSTRUMENTS
crossed cylinder
Europe: United Kingdom
mid 20th c.
metal; glass
each lens: 35 mm; overall: 182 mm x 42 mm
Triple crossed cylinder instrument. Yellow metal rim and smooth white metal handle. Comprises three lenses mounted in line and soldered to each other. No markings.
2022.167
Gift of Mr Richard Fowle FCOptom, 2015