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As mentioned in the preceding article by Dr. Jewett, the first and second of the three following memoranda were the basis of methods of designing transpositions for voice-frequency circuits. They applied particularly to non-loaded circuits but the theory was readily extended to cover loaded circuits. In an earlier and more general study written in 1904, Dr. Campbell considered the involved equations necessary to a n exact solution of the crosstalk problem and deduced simplifying approximations and convenient artifices for avoiding lengthy derivations.
A Tue, study studied this question.