MusEYEum Online Catalogue

Set of Crookes lenses
OPHTHALMIC LENSES
lens
Thomas Styring & Son Ltd
Europe: United Kingdom, England, South Yorkshire, Sheffield
Early-Mid 20th c.
glass; paper
each envelope: 55 x 50 mm

Set of 20 Crookes tint lenses in supplier's paper envelopes printed in black or blue. Chance's Crookes glass, bi-convex: +0.25 A shade (2), +0.50 A shade, +1.00 A shade +1.25 A shade, +2.00 A shade, +2.25 A shade, +2.50 A shade (2, one in blue envelope), +2.75 A1 shade, +3.00 A shade, +3.00 B shade (2, one in blue envelope), +3.50 A1 shade, +4.00 A1 shade, +5.50 A shade, +6.00 A shade (blue envelope), +9.00 A shade (2).

2006.498

Gift of Dr S. Kassam, FCOptom, 2006