Compound Microscope and Accessories, by Baker, London

This copper alloy instrument is carried on trunnions on a flat tripod foot. The upper part of the limb has a square cross section and houses a rack and pinion mechanism operated by two mill-edged knobs at the rear of the limb. This raises a bar, with a triangular cross section, from within the limb that carries the binocular body on an arm. A knob on the arm adjusts the fine focus. The inter-ocular distance is adjusted by a mill-edged knob near the top of the body that racks the eyepieces in and out of the tubes. A rotating nose below the arm takes three objectives. A bracket on the limb supports the mechanical stage. The stage plate rotates on the stage hole and a bracket with a sliding bar, to hold slides, dovetails onto the plate. A condenser below the stage can be racked up and down on its mounting for focusing. The lower part of the limb is cylindrical and a sliding sleeve carries the plano-concave mirror in a horseshoe mount.