EditorialAtelier J. Hamann, Johann Hinrich W. Hamann, telephony, room of Mr. President Krauskopf, silver gelatin paper, black and white positive process, total: height: 23.80 cm; width: 29.80 cm, dry stamp: recto: J. HAMANN, Hamburg, titled and dated: verso: ha...
EditorialAlexander Graham Bell (1847-1922). Inventor and American physicist of British origin. He devised the fundamental scheme of telephony. Drawing of the 20s.