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crossed cylinder confirmation test
OPTOMETRIC INSTRUMENTS
crossed cylinder
Hamblin
Europe: United Kingdom
mid 20th c.
metal; glass
overall: 152 x 41 mm; lens diameter: 35 mm
2003.320
OPTOMETRIC INSTRUMENTS
crossed cylinder
Hamblin
Europe: United Kingdom
mid 20th c.
metal; glass
overall: 152 x 41 mm; lens diameter: 35 mm
Crossed cylinder. White metal rim and brass handle with textured grip. Two round lenses with colour coded peripheral stickers (red = positive, black = negative).
2003.320
Ex Keeler Collection