The reslilts are given of about one hundred series of tests, each covering a range in frequency up to about 5000 cycles per second, on the impedance of long loops of parallel conductors of different metals, sizes, and cross-sectional forms. The measuring apparatus is detailed. The theory of the skin effect in solid rods and in indefinitely wide flat strips is appended in a new and simplified form. THE FOLLOWING researches were conducted, under an appropriation from the American Telephone and Telegraph Co., at the Massachusetts Institute of Technology in the Research Division of the Electrical Engineering Department, during the year 1914-15. In the early part of 1914, they were carried on under the directorship of Prof. Harold Pender. They date their origin, however, to M. I. T. thesis work undertaken in 1912-13. Brief Early Historical Outline of Skin Effect Research. The first mathematical discussion of auto-distorted alternatingcurrent density in a wire appears to have been given by Maxwell in 1873. Heaviside contributed an extensive mathematical literature to the whole subject in 1884-1887. J. H. Poynting also contributed to the mathematics of the subject in 1884-1885. Hughes developed the experimental side of the subject in 1886. Lord Rayleigh in 1886 first gave the formula for skin effect in an infinitely wide strip. Dr. H. F. Weber in 1886, J. Stefan in 1887 and 0. Lodge in 1888 contributed further material. Lord Kelvin gave the expression in ber-bei functions in 1889. Hertz in 1889 and Sir J. J. Thomson in 1893 discussed the subject both from the experimental and mathematical standpoints. Mr. J. Swinburne used the term " skin-effect " in 1891.1
The reslilts are given of about one hundred series of tests, each covering a range in frequency up to about 5000 cycles per second, on the impedance of long loops of parallel conductors of different metals, sizes, and cross-sectional forms. The measuring apparatus is detailed. The theory of the skin effect in solid rods and in indefinitely wide flat strips is appended in a new and simplified form. THE FOLLOWING researches were conducted, under an appropriation from the American Telephone and Telegraph Co., at the Massachusetts Institute of Technology in the Research Division of the Electrical Engineering Department, during the year 1914-15. In the early part of 1914, they were carried on under the directorship of Prof. Harold Pender. They date their origin, however, to M. I. T. thesis work undertaken in 1912-13. Brief Early Historical Outline of Skin Effect Research. The first mathematical discussion of auto-distorted alternatingcurrent density in a wire appears to have been given by Maxwell in 1873. Heaviside contributed an extensive mathematical literature to the whole subject in 1884-1887. J. H. Poynting also contributed to the mathematics of the subject in 1884-1885. Hughes developed the experimental side of the subject in 1886. Lord Rayleigh in 1886 first gave the formula for skin effect in an infinitely wide strip. Dr. H. F. Weber in 1886, J. Stefan in 1887 and 0. Lodge in 1888 contributed further material. Lord Kelvin gave the expression in ber-bei functions in 1889. Hertz in 1889 and Sir J. J. Thomson in 1893 discussed the subject both from the experimental and mathematical standpoints. Mr. J. Swinburne used the term " skin-effect " in 1891.1
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