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trial case & trial frame
TRIAL CASES, FRAMES AND REFRACTOR HEADS
trial case
Europe: United Kingdom, England
Early 20th c.
wood

Wooden trial case with hinged lid. Two metal clasps of the three round post type. Red silk lining to lid. Fixed tray contains 15 pairs of rimless spherical concave lenses, 15 pairs of rimless spherical convex lenses, 3 prisms and 8 blue-black filters. Marked with focal length in centimetres. Also a simple single-drop cell trial frame with white metal frame and thin sides with spatula ends.


1999.3913

Gift of Mrs Sheila Sturdy, 1974



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