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prism verger
ORTHOPTIC INSTRUMENTS
muscle balance test
Early-Mid 20th c.
metal; glass; ivory

Adjustable spectacle trial frame. White metal. Two rotatable prisms with white ivory scales and milled wheel to control adjustable browbar. W-bridge with tortoiseshell nose pad. Centre joints. Half-rigid curl sides.


2004.647

Gift of Mr Brian Mitchell, FBDO, 2004



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