Whte finish metal box, mounted on a steel rod with 12V 100W halogen lamp
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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.
Optically worked, in velvet lined case
Ground & polished faces, edges ground. Size 50 mm high & 45 mm wide.
Diffraction Gratings replica mounted on a plate glass.. 2400 (lines/in) 7500 (lines/in) 15000 (lines/in)
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