AT&T chart -- Four simultaneous conversations, 1928
safety negativePHOTOGRAPHS - SOFT NEGATIVES
Rosenfeld and Sons
USA, NY, New York
8 x 10 in.
8x10 safety negative photographed by Rosenfeld and Sons on April 3, 1928. Image of AT&T chart of four simultaneous conversations. Visible in image: line drawing of "FOUR CONVERSATIONS / TRANSMITTED SIMULTAN-/ EOUSLY OVER ONE PAIR / OF WIRES BY CARRIER / METHOD" and "Two Important Parts of the / Apparatus at the Terminals. / VACUUM TUBE / ELECTRICAL FILTER" showing "1" a man in one office talking to a man in another, "2" a man in a hotel room talking to his wife at home, "3" a man at the oil fields talking to the home office, and "4" a farm agent talking to a farmer, while two men patch their calls through at the switchboard, a view of telephone lines in the country is the centerpiece. CREDIT LINE: Mystic Seaport, Rosenfeld Collection. Typed on original negative sleeve: "31336 / 4/3/28 / 1786-6 / A T & T Co-195 Bdway, City. / Miss F J Weber, Room 536 Copy of line drawing at studio".
Mystic Seaport, Rosenfeld Collection