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Isentropic coefficient of expansion .—The square root of the ratio of the specific heat to the isopiestic coefficient of expansion of a substance, has the dimensions of a velocity. The ratio of this quantity to the velocity of sound in the substance is therefore a pure number which is proved by...
Measurement of very short time intervals; a partial deflection method .—After briefly reviewing the usual method of determining time intervals of the order of microseconds, the author describes a method in which the potential difference of a condenser after it has been discharged for the...
X-ray patterns of metals ; (1) effect of rolling .—By passing a narrow beam of heterogeneous rays through a thin sheet of metal, a pattern may be photographically recorded which depends on the crystalline structure of the metal. The authors have used this phenomenon to study the effect of...
Emission of light by gases; a partial ionization theory .—In certain cases light seems to be emitted at the instant of ionization of the gas atoms; in other cases it seems to be emitted at the instant of recombination of gas ions; and in still other cases, the light emission seems to be...
Thermal conductivity of gases .— A new method of measuring the temperature variation of the thermal conductivity of a gas , by determining the temperature distribution in the gas contained between parallel plates maintained at different fixed temperatures, is described, and also a series of...
K-Series of characteristic X-rays; theory assuming orbital motion of the radiating electron .—By combining the equation for orbital motion of an electron about a central positive charge and the Einstein photoelectric equation with the following equation for the nuclear charge, q = 2 e ( N - 3.6...
Theory of metallic conduction assuming free electrons and positive centers; comparison of computed with experimental results .—In the preceding theoretical paper the author has deduced a number of equations for the phenomena of thermoelectricity and metallic conduction. These are in fairly good...
Measurement of gas temperature .— Radiation error if the bounding surfaces are not all at the same temperature . A mathematical expression is derived which enables the radiation error to be determined for a thermo-element consisting of two wires of known diameter, if the radiant heat gained per...
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