MusEYEum Online Catalogue

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variable prism disc
TRIAL CASES, FRAMES AND REFRACTOR HEADS
variable prism; rotary prism
Europe: United Kingdom
Mid 20th c.
metal; glass
overall: 55 mm x 37 mm; prism: 20 mm

Variable prism disc. Black frame with two super-imposed prismatic lenses, rotatable in opposite directions by means of a milled head. Inscribed.


2009.197

College Purchase, 2009



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