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annealed average absorptivity Barium glass 3)a BERKELEY BRITISH STANDARDS INSTITUTION cadmium Cellulose acetate centimetre characteristics Close tolerance COLOUR Committee of Ophthalmic conditioned constringence crown glass Dense barium flint departments and scientific determination Dispensing Opticians engineering SL equipment SL Extra dense flint filters FLAMMABILITY Flint glass flint two types Glass Manufacturers Glossary of terms helium d-line illumination Incorporated by Royal INDEX AND DISPERSION Industry Standards Committee Laboratory apparatus SL lens manufacturers lenses and spectacl limits of coloration list of British manufacture of ophthalmic manufacturer's measured method ophthalmic glass Ophthalmic Industry Standards ophthalmic lens materials ophthalmic lenses Ophthalmic Opticians optical plastics material Practice SL range of wavelengths reference refractive index relating to ophthalmic revised Royal Charter Screw similar industrial operations SPECIFICATION FOR SPECTACLE specimens spectacle frames SPECTACLE LENS MATERIALS spectral band temperature terms relating thick tinted total heat transmission factor transmittance welding and similar White'ophthalmic Yearbook