This is an example of the Ross improved Gillett achromatic condenser. Itis 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. Compare this with the earlier form of the Gillett condenser.
No.1 Improved Binocular Microscope Stand.
Ross' Model (1), with two eye-pieces, coarse and fine adjustments for focusing, graduated concentric rotating stage, having 1 inch of rectangular motion, rack and screw movements, clamping lever, graduated sub-stage for holding and adjusting illuminating and polarizing apparatus, diaphragm plate, plane and concave mirrors, and Wenham's Binocular arrangement
No.1A Improved Binocular Microscope Stand.
Designed by Wenham, on Jackson's Model (2), with two eye-pieces, coarse and fine adjustments for focusing, graduated concentric rotating stage, having 1 inch of rectangular motion, rack and screw movements; clamping lever, graduated sub-stage for holding and adjusting illuminating and polarizing apparatus, diaphragm plate, plane and concave mirrors, and Wenham's Binocular arrangement
Remarks on the Binocular Microscope by F. H. Wenham
See: Ross of London chronology by T. Wayland
