Hard crown glass, refractive index 1.519 to 1.523 25 x 25 mm 32 x 32 mm 38 x 38 mm
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Rectangular, clear, all sides polished
In metal frame and handle, chrome plated
Glass, one each double convex, Plano – convex, concavo – convex, convexo – concave, Plano – concave and double concave lens, in box. Sizes in 38mm and 50mm. Lenses, Set of Six (50mm).
Metal holder with sides grooved to hold lens up to 50 mm diameter on wooden support.
75 mm long, 115 mm radii, 25 mm thickness
Fitted in plastic frame Single, x4 Double, x7 Triple, x10 Single, x4, with leather pouch
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