Made of optically flat plates cemented together. Dimensions 50 x 50 x 50 mm
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Photographic replica gratings mounted on a plate glass & suitable for visual. Grading size 25 x 25 mm, on glass plate 50 x 38 mm. The grating are of :
Whte finish metal box, mounted on a steel rod with 12V 100W halogen lamp
Optically worked, in velvet lined case
Made from moulded glass, polished surfaces (a) 75 x 50 x 18 mm (b) 100 x 60 x 25 mm.
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