Perrine, Dr. J.O.
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1940 as a quarter-century anniversary of the first time that New York ever spoke by telephone to San Francisco, across the entire breadth of this Continent. A quarter-century of communications achievement: a review. The speaker begins by displaying to the audience a simple coil of wire, with a magnet inside of it, and a piece of clock spring, that doesn't touch the magnet, placed above the coil and its magnet core, and continues with a description of Alexander Graham Bell's invention of the telephone. Advances since then. A description of the microphone the speaker is using, and how it works. Acoustic and electric waves. Advances made in the generation, amplification and control of a large gamut of electrical and acoustical vibrations. Some history. James Clerk Maxwell, who predicated that light waves and heat waves were electro-magnetic waves. Hertz, the first to prove experimentally that Maxwell was right. An appreciation of the electro-magnetic spectrum. How we learned to relate sound and electricity, and to bring them together musically. Advances in terms of distance transmission. Heaviside's idea that an electric current can be made to go much farther if you study magnetism, and the result of his suggestion. The advent of vacuum tubes. What it might have sounded like to talk to San Francisco in 1915. The beginning of the utilization of electrical wires. Sending messages. The Telegraph. Cabled wires. An explanation of how messages are sent today. Quartz crystals as one of the ways to help keep the separating lines distinct to send more messages. What electrical communications mean as a basic factor in the welter of life. Bringing the fruits of science to the service of a vast public. The speaker's wish that we could apply the methods of physical and chemical research to sociological and human problems. The social and human aspects of scientific achievement. Modern vs. ancient communications systems. Communications as one of the great agencies of democracy. The development of the printing press and of mail service also as agencies of democracies. The development of man's own abilities as an important aspect of science and research. Proof that electrical communications have given man immensely increased power. Having faith in man's basic and intrinsic goodness.