A brass disc 75 mm diameter mounted on a 62 mm rod giving an overall height of 62 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.
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 :
Polished 90 mm dia & 20 mm thick approx.
Ground & polished faces, edges ground. Size 50 mm high & 45 mm wide.
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