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The well-known results of the theory of mass spectrometers and velocity focusing devices are derived again by a different method which is simpler than the ones previously used and which brings out more clearly the electron optical nature of the deflecting and focusing properties of the fields...
The x-ray K absorption edges of copper in crystalline CuCl, CuBr, and CuI have been measured with a double crystal spectrometer. Near the edge the experimental curves have been analyzed into component absorption lines. The most intense absorption maximum is due to excitation of the K electron...
Large cosmic-ray showers in air, investigated with ionization chambers and coincidence counters, have been explained hitherto as originating from primary electrons of very high energy. In recent experiments at an altitude of 3100 meters Lewis measured the frequency of coincident bursts in two...
An alpha-ray counting system, consisting of parallel wire electrical counters and amplifying circuits, etc., is described. The conditions of reliable operation have been carefully examined and well defined. The mechanism of the counters as to why they answer only to alpha-particles but not to...
Cosmic-ray bursts of ionization occurring in each of two unshielded, thin-walled ionization chambers were recorded simultaneously on a single piece of photographic film. This recording made it possible to study events in each chamber separately, and also to determine when a burst, occurring in...
The calculations of Fröhlich, Heitler, and Kahn for the deviation from the Coulomb law for a proton owing to mesons are re-examined and extended to the scalar meson theory. A perturbation calculation is used up to terms proportional to the square of the coupling constant, including the recoil of...
The importance of a well-known theorem, originally due to Larmor, is emphasized. It enables a definition of "momentum" and "moment of momentum" for electrons in a magnetic field, hence the possibility of writing the conservation of these quantities when the geometry of the structure is...
The influence of the temperature upon dielectric absorption is studied for carnauba wax. Isothermic and non-isothermic current-time curves are measured. It is shown that a considerable part of the absorbed charge can be "frozen in," if the temperature is reduced to a value sufficiently inferior...
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