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An apparatus has been designed and constructed which is capable of measuring the adiabatic Joule‐Thomson coefficient μ and the isothermal Joule‐Thomson coefficient ϕ for gases at low temperatures and high pressures. The apparatus was calibrated with nitrogen gas using pressures as high as...
The electron emission capability of recently developed thermal electron emitters which can be delineated into small areas of almost any desirable shape by standard photolithographic processes has been studied. The emission performance is found to be comparable to standard sprayed oxide coated...
A double crystal spectrometer control has been built to precisely measure semiautomatically both the small angles (20″) of refraction suffered by a thermal neutron beam in passing through a prism and, by substitution of a compatible second goniometer element, the large angles due to Bragg...
A computer program and simple hardware are described for performing multiple channel phase sensitive detection (and synchronous signal averaging) in the low audio frequency range using a laboratory minicomputer. Additional techniques are described to provide a real‐time display of the harmonic...
A compact photoionization mass spectrometer utilizing a supersonic molecular beam sampling system is described. Beam intensities of the order of 3 × 10 18 molecules∕sr sec are obtained for CO 2 . The use of this apparatus with synchrotron radiation is discussed. Results are presented for C 2 H...
The helium cooled mass spectrometer ion source was modified to avoid the formation of a shock in front of it during a supersonic rocket flight. Thus the undisturbed measurement of major and minor atmospheric constituents including reactive species becomes possible in the denser parts of the...
A conventional electromagnet has been modified by using tapered pole caps with axial holes drilled through the pole cap faces to apply longitudinal fields to the absorber in Mössbauer absorption experiments. Fields in excess of 25 kOe are obtained with the apparatus described. In order to...
A new type of viscometer consisting of a steel tuning fork measures viscosity over a large range in a simple and convenient way. It requires only small quantity of specimen and offers hope to determine the anisotropic viscosities of ordered fluids such as liquid crystal.
A versatile and relatively inexpensive thin film deposition system which provides the selection of a number of substrate‐mask‐source arrangements is presented. The system, designed for use in a 36 cm ultrahigh vacuum chamber, uses one linear and one rotary feedthrough to accomplish all...
Circuitry for a simple and accurate ultrasonic attenuation recording system, for use with the pulse echo technique is described. Direct processing of low level signals and the use of generally available laboratory equipment reduce cost. Sensitivity is enhanced by the use of sufficient zero offset.
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