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2 prisms in box
OPHTHALMIC LENSES
prism
Crookes
Europe: United Kingdom
Mid 20th c.
plastic
1): 32 x 37 x 54 mm; 2): 9 x 19 x 28 mm; box: 115 x 53 x 53 mm
2005.308
OPHTHALMIC LENSES
prism
Crookes
Europe: United Kingdom
Mid 20th c.
plastic
1): 32 x 37 x 54 mm; 2): 9 x 19 x 28 mm; box: 115 x 53 x 53 mm
Two plastic prisms. 1) Tent-shaped, triangular section. 2) Semi-cylindrical. Together in a tall 'Crookes' box with separate lid (not necessarily related).
2005.308
Ex Monica Britton Collection, Bristol