A pointed needle, mounted on a 6 mm brass rod, giving an overall height of 80 mm approx.
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Optically worked, ground edges
Ground & polished faces, edges ground. Size 50 mm high & 45 mm wide.
Made of optically flat plates cemented together. Dimensions 50 x 50 x 50 mm
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.
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