BRANLY'S COHERER: "Variations de conductibilities sous diverses influences electriques" (Comptes rendus hebdomadaires des séances de l'Académie des Sciences; Vol. 111 pp. 785-787)

Paris: Gauthier-Villars, 1890. First Edition. Wraps. Very Good. Edouard Branly (1844-1940) demonstrates the first sensitive device for detecting radio waves, later named the "coherer." 1172 pp. 4to. Wear and cuffing to original light salmon colored wraps. Original paper label pasted to spine with Volume # and year handwritten in black ink. Clean within, most pages uncut. Text in French. Housed in custom protective chemise with gold embossed titling to spine. (Inventory #: 27363)