A Radio Talk by Charles F. Kettering Today when we hear the word "telegraph" we naturally think of an electrical device, but many other methods of sending messages have been designed by men through the ages. Over 3,000 years ago the Greeks relayed back to Greece news of the capture of Troy, by signaling with fires. The American Indians used puffs of smoke for signals. One of the largest of the mounds they used for this purpose is near Miamisburg, Ohio, about 10 miles from Dayton. Tribes in Africa and on the islands of the Pacific have for centuries had a form of telegraph, using specially made drums; for extreme distances a listening drum is exactly tuned to the same tone as the sending drum. |