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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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).
Fitted in plastic frame Single, x4 Double, x7 Triple, x10 Single, x4, with leather pouch
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
Rectangular, clear, all sides polished
Diameter 25 mm, mounted in plastic eye-grip frame x 2.5 x 3 x 3.5 x 4
Wooden, with V shaped slot to take spherical lens or mirror up to 75 mm diameter, with index mark. Lense holder, Wooden, 'V' Shaped.
Free from air bubbles, all sides polished
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