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crossed cylinder confirmation test
crossed cylinder
Europe: United Kingdom
mid 20th c.
metal; glass
each lens: 35 mm; overall: 193 mm x 41 mm

Triple crossed cylinder instrument. White metal rim and handle with textured grip. Comprises one +/-0.20 crossed cylinder lens at top, with separate +0.50 and -0.50 spherical lenses beneath. Markings in red and white.


Gift of Mr Richard Fowle FCOptom, 2015

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