Abridgment of two-way television: Part I — Image transmission system: Part II — Synchronization system: Part III — Sound transmission syst

Ever since the initial demonstration of television both by wire and by radio at Bell Telephone Laboratories in 1927, experimental work has been steadily pursued in order to learn the problems and possibilities of this newest branch of electrical communication. The latest development to be demonstrated is that of twoway television as an adjunct to the telephone. As a result of our development work, there is now set up an experimental and demonstration system between the headquarters building of the American Telephone and Telegraph Company at 195 Broadway and the building of the Bell Telephone Laboratories at 463 West Street, New York City, two miles away. This system makes it possible the experiment with a method of communication in which the parties engaged not only speak with each other but at the same time see each other. Study of this system will serve to give information on the importance of the addition of sight to sound in communication and will give valuable experience in handling the technical problems involved.