Instruments scientifiques des XIXème et XXème siècles - Brass folding compass and square (foot/metre). Late 18th or early 19th century. Length : 16.6 or 15.9 cm. Stains, scratches from use. - four folding compasses in brass, wood or bone, and a lot of compass parts. Late 19th century or early 20th century. Length: compasses 6.5 - 9.3 -16.8 cm. Stains, scratches from use. - Arabian sundial in wood and printed paper, with retractable brass style. In its cardboard case (damaged). Late 19th century. H. 14.3 cm. Condition of use. - Pocket sundial, in the shape of a pocket watch, in grey metal with mobile style and compass. Early 20th century. Diameter: 4.4 cm. Scratches. - Armillary sphere in patinated brass, on a tripod base. 20th century. H. 23 cm. Wear to the patina ; base of the sphere glued back. ATTACHED : Two medical scarifiers : - one in bronze and spring iron with a quadrangular body. Late 18th or early 19th century. 6.5 x 4.5 x 3.7 cm. Hard spring. Oxidation, scratches and wear. - a stainless steel butterfly key with a circular fluted body, ORTHOS brand. H. 5.8 cm - Diameter : 4.4 cm. Spring blocked, blades not coming out anymore. Scratches. Used to make small parallel grooves in the skin in congested areas, before the application of suction cups, called "scarified".