EUROPE, XXème siècle - Small spyglass in brass and mahogany. Deployable in four cylinders. Not signed. Open length : 40.5 cm - Closed length : 15 cm. Scratches, some shocks and oxidations. - Two pairs of theater binoculars in black patinated brass or sheathed in black leather. Length: 10.5 or 9.5 cm. Wear to the patina, oxidations, shocks, a cracked ring, a screw of maintenance (black leather) missing. - KORELLE or FOTH-DERBY Two cameras. Very average condition, for parts. In brown leather cases, reported (used). ATTACHED: Four thermometers, three of which are wall-mounted: - one centigrade and in Reaulur, wall, plate, swivel, graduated glass (reference to 1838). Signed SECRETAN, Opti[ci]en de S.M. l'Empereur, Paris. Turntable in molded mahogany. H. plate: 36 cm - H. plate: 30.8 cm. - a centigrade, wall-mounted, with a glass tube containing a graduated paper. Signed RICHEBOURG, Opt[ci]en quai de l'horloge 29, in Paris. Stained wood turntable. H. plate : 29.5 cm - H. : tube : 20.5 cm. - a centigrade, wall-mounted, with a glass tube containing a graduated paper. Signed O. ROUSSEAU and his sons, in Paris. Stained wood turntable. H. plate : 36.8 cm - H. : tube : 30 cm. - a centigrade 160°, for liquids, with glass tube containing a graduated paper. Signed RICHEBOURG, Optician Quai de l'Horloge 29, in Paris. Cylindrical cardboard case. H. : tube : 34.5 cm. Provenance : Laboratory of Auguste VERNEUIL (1856-1913), inventor of synthetic ruby.