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An apparatus is described which is suitable for a study of the velocity distribution of ions formed by single electron impact Electrons, confined to a narrow beam by a magnetic field, pass along the axis of two coaxial cylinders, ionize the gas, and are collected by a trap. The thick, inner...
It is shown experimentally that none of the alkali metals will allow radio-frequency oscillations to be generated across an arc in hydrogen, but that the alkaline earths will do so: a confirmation and extension of previous work. Spectra have been photographed of the two groups of elements when...
Measurements have been made of the extent of polarization in the fluorescence light from glycerine solutions of uranine and rhodamine-B. The results indicate that the fluorescence light is polarized to the same extent throughout any one fluorescence band; or, if there is a variation which these...
The mobility of air ions produced by x-rays has been measured by the simple Rutherford alternating current method. No change in mobility with age could be detected for ions aged as long as one second. The weighted average of the results gives 1.64 ± 0.05 and 2.25 ± 0.05 cm/sec per volt/cm for...
Experimental procedure in the study of fluctuations in the space current of a thermionic emitter is outlined. A new method of measuring shot-circuit impedance is introduced. Conditions under which the observed fluctuations may be applied to determine the electronic charge are pointed out. A...
Measurements have been made by both photographic and single-crystal ionization methods of the shift in wave-length of scattered x-rays at angle of about 170°. The photographic method was that introduced by Sharp, but the K β line of molybdenum was used. Two exposures of several hundred hours...
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