Subject croidys pierre (1 risultati)

103, [1 (blank)] pp. Text in French. 12mo. 7" x 4-3/4" 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]. Square & tight. Modest wear. Age-toning to paper. Very Good Plus Printed buff paper covers. Now housed in an archival mylar sleeve Early, if not the first, printing, ca 1942.…