Inverted microscope, called "photographic and chemical" microscope, invented by Filippo Pacini and built by Angiolo Poggiali. The brass base carries a brass box containing a total-reflection prism. In the box are inserted the mobile stage and the inclined body-tube, fitted with a Huygenian eyepiece. Coarse focus is by moving the stage by rackwork. Fine focus is by adjusting the stage tilt with a knob. Two tapered pillars inserted in the base support the illumination mirror and a condenser lens. There are also a body-tube carrying a prism and a negative lens. This body-tube was probably used with a photographic camera.