Compound Microscope, by James Swift & Son, London, c.1900

The cast copper alloy tripod foot is formed by a wide curved back. The limb is supported on trunnions, with a bar moved by diagonal rack work for focusing. At the top of the limb is the short arm that holds either a Stephenson-type binocular tube or a monocular tube. The arm can be rotated to one side. Fine focusing is by a knurled knob on the arm, which is marked 0-20. The stage is on a large circular platform that is marked 0-360. Specimen slides are gripped by a pair of sliding bars. The sub stage assembly is on rack work to focus the condenser. The plano-concave mirror is on an articulated arm. The mahogany case also holds a monocular body tube, a circular stage, a copper alloy can of filters and apertures, A sub stage Nicol prism polarizer and an eyepiece analyser, two eyepieces, an objective in a can, a cylinder with a stop, eight handles for brushes and pins and ten glass phials.