Bausch & Lomb Monocular Microscope, No. 232

This is a monocular microscope on a metal three-pronged base. Coarse adjustment is via rack & pinion. The fine adjustment is a "short-arm focus" adjusted with a horizontal screw on top of the curved vertical support arm. The stage is a rectangular glass plate with hole in the center. An interesting mechanical feature is the double columnar supporting pillars. Marked under the left-side coarse adjustment screw: “Patented Oct. 3,1876.”
Age: c1880
Made by: Bausch & Lomb
Made in: England