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The theory of the interpretation of seismic travel‐time curves for refracted rays in horizontal structures is treated after the manner of Herglotz‐Wiechert, under the customary assumption that the ray paths obey the laws of geometrical optics. Multiple valued travel‐time curves,...
The capillary rise of oil in vertical strips of impregnated paper obeys the same law as the rise of liquids in capillary tubes of circular cross section. From the viscosity and surface tension of an oil and its rate of rise in a given paper, it is possible to compute the ``effective capillary...
In this paper is discussed the problem of measurement of the small, but not always negligible, phase angles of resistors, with special reference to shielded resistors of 1000 ohms and above. Several types of shielded resistors are described briefly, among which is the ideally shielded,...
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