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variable prism disc
OPHTHALMIC LENSES
variable prism; rotary prism
Mid-Late 20th c.
metal; glass
overall: 62 mm x 19 mm; width with handle: 96 mm

Variable prism disc. Black metal rim with two super-imposed prismatic lenses, rotatable in opposite directions by means of a milled-head handle. Inscribed from 0-15 in both directions.


2012.67

Gift of Mr Lawrence Jenkin, 2011



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