The relation between brightness temperature, true temperature and colour temperature for a
tungsten ribbon filament lamp has been calculated. The calculations were based upon the …

This article deals with the radiation, which is emitted by a body because of its temperature
and which for this reason is called temperature or thermal radiation. The radiant energy …

A survey is given of the standards used in photometry and spectroradiometry. After an
introduction in Sec. I, the candela and lumen standards are discussed in Sec. II. Some problems …

From the two series of measurements of the total and specific ionization, it is possible to deduce
the mean ionization curve of an alpha particle with given range, on certain assumptions …

Measurements were made of the specific ionization of Po α-particles in hydrogen and helium
by means of an ionization chamber, combined with a pulse amplifier. The Bragg curve …

Durch Einstellung auf gleichen Helligkeitseindruck einer kleinen farbigen Prüffläche und
einer weissen Vergleichsfläche, wobei der Vergleich bei simultaner oder sukzessiver …

The absolute spectral radiant intensity of a high intensity alternating current carbon arc has
been measured in the wavelength region from 260 to 600 mμ. The radiant intensity increases …

CURRENT-ZERO PHENOMENA IN ARCS 249 natural possibility for the de-ionization of the
arc path after the preceding half cycle. Whether the arc will restrike or extinguish depends …

The radiant intensity of a black body at the gold point has been measured for three wavelengths.
From these measurements a value of Planck's second radiation constant c 2 = 1·432 5 …

There are two general methods for measuring a quantity of radiation emitted by a source.
One can compare it with the radiation emitted by a standard source or one can measure the …