Plane, circular, ground edges. Back silvered with protective coating
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Kit includes 5 liters round bottom flask with cork, support ring, fluorescein and 3 lens to demonstrate long, short and normal sight.
Comprising a metal holder with sides grooved to hold the lens or mirror. The holder is finished in matt black & is free standing for bench use, to hold lens 50 mm in diameter.
Polished 90 mm dia & 20 mm thick approx.
Rectangular, all sides polished, made from slightly greenish glass free from bubbles Dimensions (a) 75 x 50 x 12 mm (b) 75 x 50 x 18 mm (c) 100 x 60 x 18 mm (d) 115 x 65 x 18 mm (e) 125 x 65 x 18 mm.
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