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variable prism disc
TRIAL CASES, FRAMES AND REFRACTOR HEADS
variable prism; rotary prism
Theodore Hamblin Ltd
Europe: United Kingdom, England, London
Mid 20th c.
metal; glass
1999.3006
TRIAL CASES, FRAMES AND REFRACTOR HEADS
variable prism; rotary prism
Theodore Hamblin Ltd
Europe: United Kingdom, England, London
Mid 20th c.
metal; glass
Variable prism disc from a trial set. Black frame with two super-imposed prismatic lenses, rotatable in opposite directions by means of a milled head. Inscribed.
1999.3006