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 :
Type | A | B | C | D | E |
Size (lines/mm) | 300 | 600 | 2400 | 7500 | 15000 |
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 :
Type | A | B | C | D | E |
Size (lines/mm) | 300 | 600 | 2400 | 7500 | 15000 |
Optically worked, in velvet lined case
Type | Size |
A | 40 x 32 mm |
B | 50 x 40 mm |
Optically worked, in velvet lined case
Type | Size |
A | 40 x 32 mm |
B | 50 x 40 mm |
Ground & polished faces, edges ground. Size 50 mm high & 45 mm wide.
Type | A | B | C |
Focal Length | 70 mm | 150 mm | 200 mm |
Ground & polished faces, edges ground. Size 50 mm high & 45 mm wide.
Type | A | B | C |
Focal Length | 70 mm | 150 mm | 200 mm |
Ground & polished faces, edges ground. Size 50 mm high & 45 mm wide.
Type | A | B | C |
Focal Length | 60 mm | 150 mm | 300 mm |
Ground & polished faces, edges ground. Size 50 mm high & 45 mm wide.
Type | A | B | C |
Focal Length | 60 mm | 150 mm | 300 mm |
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