Compound Microscope with Accessories in Case, by Powell & Lealand, Later 19th Century

The heavy copper alloy limb is supported on the tripod base on trunnions. A rack and pinion, operated by two double mill-edged knobs, extends and retracts a dovetail bar from the limb for focusing. An arm at the end of this bar supports the monocular body tube. At the base of the arm a graduated knob operates the fine focus. The mechanical stage is graduated to show the movement of the specimen. The stage assembly also allows rotation and a graduated ring indicates the angle of rotation. A condenser is mounted below the stage, which can be racked up and down for focusing. A cylindrical bar extending below the limb carries the plano-concave mirror in a horseshoe mount on a double articulated arm. Associated with this instrument are a bulls-eye lens on a stand with weighted base, a Nicol prism with a copper alloy can, a binocular body tube, and a double screw-tightened clamp on a stand. There is also a spectroscope signed by John Browning (63 strand, London) consisting of a straight copper alloy tube with a focusing mechanism.

The rectangular wooden case has wooden fittings inside which are lined with blue felt. The metal fittings are copper alloy, including a large handle at the top. There is a glass panel in the door at the front. Two pieces of cloth are also stored within the case, one blue and the other is cream.