Browse Items (3473 total)

Brass mounted pair of lenses fixed to a wooden block. Possibly a piece of a telescope. With leather lens cap.

Small lens held in brass frame on metal pole above a set of cross hairs.

A brass stand with a large circular metal lens holder attached. Lens included.

Metal cylindrical holder on wooden base with metal pointer and ball bearing to ease movement along optical bench

Metal cylindrical holder on wooden base with metal plate along side to ease movement along optical bench

brass stand with large round metal lens holder.

Brass stand on stone base with large circular metal lens holder and small plate with engraving on it.

Leslie's differential thermometer. Double bulbs on ends of a tube set into delicate wooden base. One bulb blue, one clear; liquid (blue) broken column. Faded mark on underside base showing existence of rectangular label.