Abstract
A cryostat is described in which the fluorescence spectra of four solid specimens may be obtained by rotating each specimen in turn into focus by means of a tube operated externally. Although designed primarily for obtaining fluorescence spectra in ``reflection,'' the cryostat may also be used to obtain such spectra in ``transmission'' or for the measurement of conventional absorption spectra. Helium is used as a transfer gas and the temperature is determined by a Bourdon pressure gauge used as a gas thermometer. The level of liquid helium in the reservoir is determined with the help of carbon resistors. The specimens are mounted on a small cage which may easily be removed from the cryostat and sealed back into place with an indium gasket. The cryostat is made of metal and is easily demountable.
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