Compound Microscope, by Andrew Pritchard, London, c. 1845

A cylindrical pillar stands on a flat tripod foot, inscribed with the manufacturer's name. A pinhole on the foot holds the concave mirror. The reverse of the mirror is a plaster disk. A rack and pinion, operated by a mill-edged knob on the rear of the pillar, extends a triangular bar, supporting the optical components. The monocular body tube mounted is on an arm screwed to the top of the bar. The eyepiece pushes into the top of the tube and the lower end has nose, mounted on a spring, which has an internal thread to take the objective. The stage is a copper alloy plate with a threaded stage hole and four pinholes. There are two eyepieces, two objectives, one with a Lieberkuhn, a copper alloy aperture disk, an aperture disk with a copper alloy tube attached, a Nicol prism, stage forceps, a specimen chamber on a brass copper alloy plate, three glass slides and a blackened copper alloy plate that fits onto the stage. The fitted box is mahogany and the supports are faced with blue velvet.