This microscope, of the maison Chevalier, represents one of the best examples of art and engineering of the 19th Century in the field of microscopy. The vertical cylindrical pillar is screwed in a boss on the case and at the top ends with a compass joint, holding the squared section limb that is also pinned at the bottom of the pillar with a peg with a knurled brass handle. A short bracket is fixed to the limb and holds the horizontal body tube. On the rackwork cut on the limb run the pinions for the stage and for the large double mirror, with a plain side of 50 mm and concave side of 83 mm diameter. The mirror can be oriented by a gymbal and two knurled knobs.