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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...
Eastman NTA photographic plates have been bombarded with alpha‐particles and deuterons in the 184‐in. Berkeley cyclotron, and photomicrographs of sections of tracks have been made and are reproduced here. The trajectories do not lie in the emulsion for the entire range of the particles, and...
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