Made of optically flat plates cemented together. Dimensions 50 x 50 x 50 mm
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Made from moulded glass, polished surfaces (a) 75 x 50 x 18 mm (b) 100 x 60 x 25 mm.
Optically worked, back silvered, with protective coating.
With holder & choke 80W & 120W
Ground & polished faces, edges ground. Size 50 mm high & 45 mm wide.
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