Compound Microscope with Accessories in Case, by Powell & Lealand

The instrument has a limb, carried on trunnions on a tripod. Two double mill edged knobs on the rear of the rectangular limb extend a bar, with a dovetail cross section, supporting the optical components. A binocular or monocular body can be screwed onto an arm, inscribed with the maker's name. Objectives screw into a cylinder on the underside of the arm. A graduated screw on the arm moves the cylinder for fine focusing. The stage is mechanical and the stage plate has a sliding, sprung bracket to hold specimens. A mechanical mounting for a condenser is set on a plate that can be racked up and down below the stage. A sleeve on the cylindrical lower end of the limb holds the plano-concave mirror on an articulated arm.

The instrument is stored in a mahogany case, which contains a box of accessories including two a monocular body tube, a binocular body tube, eight objectives, four eyepieces, two three substage assemblies with a choice of apertures, an achromatic condenser, and a number of prisms and camera lucida four Nicol prisms and analysers, a compressor, a live box, two prisms in leather cases, a selenite disc changer, two camera lucidas, an opaque specimen holder in can, five collars, a stage slide holder, a Wenham's Parabolic lens, a prism with rotatable aperture disc, a substage condenser, an arm for holding stage tools, an adjusting key, a draw tube extender and two metal discs.