Ross, London, #4001 c. 1875
Binocular Jackson model No. Ia
Tube marked "Wenham's Binocular by Ross London"
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The achromatic condenser is marked: Ross 2053, London. It has two diaphragm disks that can be used in combination where each is controlled by a milled knob. The upper disk has conventional graduated apertures while the bottom disk has apertures for dark field and oblique illumination. |
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