Compound Microscope with Case and Accessories, by Andrew Ross, London, c.1845

This is an early example of the design by Ross which introduced  the Y-shaped of foot that became popular in England. Side plates hold trunnions that support the limb. A triangular sectioned bar can be racked up from within the limb and the monocular body tube is carried on an arm attached to the top of the bar. A conical nose, with an external thread for objectives, screws into the underside of the bar. The stage has a collar on which a plate with a sliding rest for specimens is mounted. A rotating disc with three apertures is attached to the underside of the stage. The Plano-concave mirror is set on a post below the stage. The instrument stands on a board that slides into a fitted mahogany case with two hinged doors. Two eyepieces and an objective in a can are present.