Polished 90 mm dia & 20 mm thick approx.
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With holder & choke 80W & 120W
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 :
Diffraction Gratings replica mounted on a plate glass.. 2400 (lines/in) 7500 (lines/in) 15000 (lines/in)
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