Paris: Maison de la Bonne Presse, (n. d.). Early, if not the first, printing, ca 1942. 103, [1 (blank)] pp. Text in French. 12mo. 7" x 4-3/4". Printed buff paper covers. Now housed in an archival mylar sleeve. Square & tight. Modest wear. Age-toning to paper. Very Good Plus. Item #49441
Branly was a French inventor, physicist and professor at the Institut Catholique de Paris. He is primarily known for his early involvement in wireless telegraphy and his invention, around 1890, of the Branly coherer, the first widely used detector for radio communication. [Wiki].