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In 1928 Jacob Levy Moreno, a Vienna-trained psychiatrist who had recently emigrated to New York, developed an innovative way of identifying ‘at risk’ children. He analysed social patterns at the State Training School for Girls and the Riverdale Country School by asking students who their friends were, and charting their answers. The resulting graphs used …

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THE recent development of various methods of modulation such as PCM and PPM which exchange bandwidth for signal-to-noise ratio has intensified the interest in a general theory of communication. A basis for such a theory is contained in the important papers of Nyquist1 and Hartley2 on this subject. In the present paper we will extend …

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