"Camera lucida", invented by Abbe. Belonged to De Marchi, 1930s.

The "camera lucida", invented by Abbe at the end of the 800, was used for drawing images from microscope contouring an image projected on a paper sheet. It is a special eyepiece that contains a prism. This deflects the image in an optical path perpendicular to the usual one, from objective to eyepiece. The image is caught by a mirror which, properly angled, projects the image on a sheet of paper.