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24
Radio Broadcast
work begun by Dr. William R. Hainsworth at the Massachusetts Institute of Technology, Cambridge, Massachusetts, in November, 1921. From that time until March, 1923, the investigation centered on the use of methods paralleling very closely those made public by the American Telephone and Telegraph Company last summer. Austin G. Coolev, then a student at the Massachusetts Institute of Technology, joined Dr. Hainsworth in the fall of 1922 for the purpose of assisting in the application of radio to the equipment which was being operated satisfactorily in the laboratory.
Having become convinced that this system was too unreliable, that it was definitely limited in speed, and that it was encumbered
with so many obstacles in the way of its future acceptance as anything but an elaborate laboratory toy, in the spring of 1923 they decided to abandon their ideas and to start out along entirely different lines of research.
C. E. Tucker, a well known authority on electrical communication; Prof. F. S. Dellenbaugh, a prominent electrical engineer; Dr. F. G. Keys, director of the Physical Chemistry Department at the Institute; Captain Clayton and Sergeant Truax, both of the United States Army Signal Corps, were a few of the members of the faculty of the Massachusetts Institute of Technology who took an active interest in the Cooley-Hainsworth development work and furnished valuable assistance in securing
RECEIVING APPARATUS OF THE RANGER SYSTEM Used by the Radio Corporation of America. The picture is printed on the small revolving drum in the foreground which is driven by the motor directly behind it. Exact synchronism between the motor of the transmitting and receiving apparatus is an essential of all photographic sending systems. The first public demonstration of this system took place during the week of December 1, 1924, between New York and
London