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polarising filters
Europe: United Kingdom, England
Mid 20th c.
metal; plastic
overall: 72 mm x 114 mm

Polaroid test. Pair of rimless D-shaped plastic dark-tinted lenses at a fixed p.d. mounted on light grey plastic-coated metal bar designed to hook over the front of a trial frame and to serve as handles for the practitioner to position the device.


Gift of Mr Martin Ruddy, FCOptom, 2013

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