A direct reading ionization gauge for pressure measurement, a calibration of standard radio tubes as ionization gauge, and a determination of the vapor pressure curve for solid titanium tetrachloride

.The work to be described in the following pages falls naturally under three distinct headings, and will, therefore, be taken up into three separate sections. The work on the Direct Reading Ionization Gauge as performed under the direction of Mr. C. G. Found of the General Electric Research Company and is the subject of a paper by him and the author now in the hands of the editors of the Journal of the Optical Society of America and Review of Scientific Instruments. The remainder of the work reported here was done by the author at the Research Laboratory of the General Electric Company under the direction of Dr. Saul Dushman