A brass disc 75 mm diameter mounted on a 62 mm rod giving an overall height of 62 mm
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Optically worked, in velvet lined case
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.
Diffraction Gratings replica mounted on a plate glass.. 2400 (lines/in) 7500 (lines/in) 15000 (lines/in)
Optically worked, ground edges
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