Abstract
I HAVE read with great interest Mr. Cohen's letter, but regret that I still have only the haziest notions of what the various kinds of transmission units are, about which there is so much controversy. I thought at first they were the ‘telephone traffic units,’ but as these depend on the calls in a specified period of time (see B.E.S.A. glossary No. 9932) it could not refer to them. Mathematical engineers like Dr. Fleming call the wave-length constant and the attenuation constant. Apparently a distortionless circuit is considered. I assume that a homogeneous circuit is the same as what Heaviside called a distortionless circuit. Until clear, mathematical definitions of the ‘transmission units’ are given, it seems a waste of time to discuss them at international or other meetings.
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Standardisation of Telephone Apparatus. Nature 120, 953 (1927). https://doi.org/10.1038/120953b0
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DOI: https://doi.org/10.1038/120953b0
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