Lot of scientific instruments from the 19th and 20th centuries: - POURIN, "Au P couronné". Small two-pan iron and brass balance. In walnut box. Label on reverse of lid. Length: 14 cm. Some oxidation. - ROCHETTE, Paris. Achromatic microscope. Brass mount and accessory in a mahogany box. The lid forms a base with a screw thread. Signed on the optical cylinder. Stains, oxidation, accidents and missing parts. - Polished metal level, model 1888, forming a square. - Openwork metal compass with two points. H. 20 cm. - 5 small folding meters in wood and brass, brass or metal, graduated. = as is.