Negretti & Zambra.
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This large compound binocular microscope is a variation on the popular Ross model (see our instrument 1.025, Ross 563). The Y-shaped foot supports the vertical double pillars, attached to the boxy limb by means of trunnions. The binocular tube has the adjustment mechanism by rackwork (with dual knobs) in the back. It comes with a mahogany carrying case with glass door, a wooden platform for the instrument, and accessories. Signed: Negretti & Zambra London.