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A method based on the variation of electrical resistance in a wire element introduced into the charge has been developed for the continuous measurement of burning and detonation rates in opaque materials. The method has been used to obtain data on nonsteady‐state phenomena in high explosives,...
A magnetic quadrupole of rectangular aperture, employing current sheets bounded by iron rather than shaped pole faces to establish the field, is described. The performance of a rectangular quadrupole of aperture 4×23 in. is reported.
Eight refractory dielectrics were exposed, under controlled conditions, to cesium gas at temperatures as high as 1475°C. The apparatus designed for this work and results of this investigation are discussed.
Experiments investigating the use of semiconductors for low‐pressure measurements proved that thermistors give the best results. These experiments led to the construction of thermistor systems consisting of miniature thermistors fixed to thin metal foils. With these systems it is possible to...
A method for the rapid determination of vacuum outgassing rates is described. Automatic range selection and automatic recording is used to accomplish this. Outgassing rates from 10−3 to 10−7 torr liter per second can be determined.
The use of beryllium copper and stainless steel in the construction of pressure vessels to contain 20 000 kg∕cm 2 is described. Machine drawings are given for the construction of different types of pressure vessels, different types of seal, and methods of introducing electrical leads into the...
A system has been developed which combines pre‐ and post‐acceleration pulsing of the beam from a Van de Graaff accelerator. It has the advantages of low belt charge for a given target current, low background at the detector, and high time resolution. The internal pulser operates at a...
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