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An experiment has been done to determine the relative vacuum properties of a number of the commercially available synthetic dielectrics. The results show wide differences in vapor pressures and indicate that certain materials are particularly well adapted for use in vacuum systems.
A low voltage arc of the ``capillary'' type which has given reliable performance since its installation in 1940 is described. The design stresses simplicity and reliability, but no special attempt is made to attain very low consumption of gas. Operating at an arc current of 0.75 ampere and...
The Mach interferometer has been used to study a supersonic air jet, and the method of adjustment, measurement, and evaluation of interferograms, calculation of densities, and typical results are given. A satisfactory light source embodying speed, monochromacy, and brilliance has been found. The...
Counters filled with small percentages of the halogens mixed with the inert gases produced self‐quenching counters. The lifetimes of these counters in terms of total counts are apparently unlimited. Several mixtures exhibited thresholds below 250 volts at total pressures ordinarily used in...
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