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The construction and calibration of a squeeze‐section phase shifter for microwave measurements is described. A table from which calibration curves may be drawn is included.
Apparatus and experimental techniques for Zeeman‐effect measurements on microwave spectra are described. The method uses a wave‐guide type absorption cell and provides for either π‐ or σ‐type observations. Molecular rotational and nuclear gyromagnetic ratios are found to be measurable...
The behavior of cylindrical counters filled with argon of various purities has been studied in the corona discharge zone. In this zone the counters act in a normal proportional manner with regard to the detection of α‐particles. The amplitude of pulses obtained is found to be independent of...
A simple current integrator has been designed for use in connection with electrostatic accelerators. It is capable of integrating currents higher than 10 −8 ampere. A compensation resistor in the input circuit of the integrator is at the same time utilized as a shunt resistor for an electronic...
Thin self‐supporting films of SiO have been prepared by evaporation onto Zapon film backings which were afterwards removed by ion bombardment or solvents. The films are approximately 100 atoms thick (8 μg/cm 2 ) and will withstand a 3‐mm Hg gas pressure differential over a disk of 8‐mm...
Several proportional fission neutron counters are described which use a uranium compound as the neutron sensitive material coated on the inside surface of the cathode. The counters are filled with high purity argon gas which produces very fast, clean pulses. The instruments use a discriminator...
The pole faces of a wedge‐shaped magnet can be shaped so as to reduce the image distance for simultaneous horizontal and vertical focusing, and thereby increase the intensity at the image. The field inside the magnet is assumed to behave as r −n , where r is the distance from the center of...
A microtome has been built incorporating the principle of deflection of a cantilever to provide the highly reproducible motion necessary in cutting thin sections for electron microscopy. The prototype has been tested, and representative electron micrographs are shown. Alternative designs are...
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