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A crystal spectrograph for measuring absorption coefficients of soft x-rays in gases has been constructed, and with it absorption coefficients of air, argon and oxygen have been measured for spectral lines of wave-lengths 1.537, 2.284, 4.145 and 6.973A. Absorption coefficients in the regions...
Tantalum was carefully outgassed and it's photoelectric properties studied after stable conditions were reached. Heating 1000 hours at temperatures up to 2200°K produced an apparent stable condition of the surface. Curves, showing the variation of the photoelectric current as a function of the...
An infinite number of straight vortices of equal strengths and the same sense of rotation are parallel and uniformly spaced in an infinite plane. If one vortex is slightly displaced, remaining parallel to the others, its velocity does not in general lie in a plane which passes through its...
By use of a modification of the photographic method described by Claus the authors have compared the intensities of x-rays of wave-length 0.43A diffusely scattered from sylvine at angles in the range 25° to 90° at a temperature of 90°K with the intensities at these same angles at a temperature...
The arc spectrum of nitrogen has been excited with low voltage arcs in mixtures of argon and nitrogen. A comparison of the intensities of the lines showed that the strong N I lines were as intense as the moderately strong argon lines. The excitation takes place probably in two steps, the first...
The dielectric constant of commercial nitrogen, 99 percent pure, was measured at pressures up to 167 atmospheres by the same electrometric method previously employed by the writer in the determination of K for air. ( K - 1 ) was again found to vary directly with the pressure, at the rate of 556×...
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