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IN a paragraph on the last number of Terrestrial Magnetism, in NATURE of March 1, p. 421, I notice the following sentence: “Dr. Lüdeling investigates graphically the phenomenon of the diurnal ...
Vectors and Vector Diagrams applied to the Alternating Current Circuit. By W. Cramp C. F. Smith. Pp. xvi + 252. (London: Longmans, Green and Co., 1909.) ...
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