Absorption, excitation, continuous fluorescence, and pulse fluorescence measurements were made on ruby samples with 0.94% and 2.1% Cr+3 in the temperature range from 4.2K up to 700K.

Vol. 58, "Festband/P. v. Groth zum achtzigsten Geburtstag gewidmet (23. Juni 1923)."

Vol. 58, "Festband/P. v. Groth zum achtzigsten Geburtstag gewidmet (23. Juni 1923)."

Vol. 58, "Festband/P. v. Groth zum achtzigsten Geburtstag gewidmet (23. Juni 1923)."

The ionic radii are adjusted for their common oxygen coordinations. The text contains detailed instructions for using the charts, as well as definitions of the terms appearing on them. (Author).

The problem of x-ray crystal structure determination require some type of automatic computing machinery.

A device was designed, built, and tested, which facilitates the rapid orientation of crystals by direct inspection of an electronically intensified optical image of their Laue patterns.