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'Bi-Spheres' Spherical lens and envelope
OPHTHALMIC LENSES
lens
British Optical Lens Co.
Europe: United Kingdom, England, Birmingham
c.1936-1948
glass; paper
envelope: 57 mm x 56 mm; overall (lens): 47 mm

Round glass bi-convex spherical lens blank, unedged. Together with original supplier's square-shaped white paper envelope, front overprinted in dark blue, with oval-framed BOLCO logo and address.


2011.34

Gift of Mr Graham Banyard, City University, 2011



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