Found - Du Bois-reymond Type Spool, Circa 1880

Small coil of the Emil du Bois-Reymond type but modified by Gustave Trouvé. The instrument bears the label "Appareil Trouvé. Breveté SGDG Marque de fabrique - [EUREKA]", repeated on the inside of the cover. This small medical electricity coil or electro-medical device is of the type invented by the German physiologist Emile du Bois-Reymond with its inner tube allowing the intensity of the electric discharges to be modified/vary. To this first original device, Gustave Trouvé added a second adjustment system of his own and which he patented on June 21, 1776 under the title "improvement to electro-medical devices", patent number 113431. This ingenious device consists "in the use of a trembler, or armature, of special arrangement to be at will and instantaneously increased or decreased in length and thus produce a variable number of intermittencies according to the law of the pendulum" (see the patent). Rare miniature medical electricity coil according to Gustave Trouvé. The closed box: 4.5x5.5x9.5cm. The electrodes are missing.