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The efficiency of a tetrahedral‐hinge high pressure apparatus was studied using four anvil sizes from 38.1 to 63.5 mm on the edge and the transitions of bismuth I‐II (25.4 kbar), thallium (37 kbar), and barium (59 kbar) as calibration points. Efficiency is defined as the pressure of the...
The exposure time of field ion micrographs at normalized pressure and voltage represents a figure of merit for comparison of various intensifier systems. External image intensification with a commercial RCA tube reduces the exposure time by a factor of more than 10 4 , allowing recording of...
An instrument for determining the energies of accelerator particle beams in the 0–9 MeV range has been built in the form of a coaxial cylindrical cavity. It has been used to establish data points in the vicinity of the Coulomb‐nuclear interference minimum in p‐p scattering at 382.43 keV,...
The adherence of films on oxide substrates is measured by a scratch‐test technique using a commercially available hardness tester. Test results viewed by transmitted light on transparent substrates show (1) how contamination can cause failure of potentially‐adherent film and (2) how a...
An apparatus for the measurement of ultrasonic absorption in liquids and solutions is described. The optimum frequency range is 1 to 60 Mc. Notable features of the apparatus are the 1‐m liquid path length available, ±0.05° temperature control of the working liquid from 0–65°C, the simple...
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