1st public demonstration of inter-city television

By 1927 AT&T had created its earliest electromechanical television-videophone called the ikonophone (from Greek: "image-sound"), which operated at 18 frames per second and occupied half a room full of equipment cabinets.An early U.S. test in 1927 had their then-Commerce Secretary Herbert Hoover address an audience in New York City from Washington, D.C.; although the audio portion was two-way, the video portion was one-way with only those in New York being able to see Hoover.