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- Variable Volume Dosimeter Ionization Chamber
- This variable volume ionization chamber was made by Dr. Lauriston S. Taylor in the mid 1930s for measurements of very high dose rates of the order of 1000 roentgens per minute. The high voltage electrode is connected to the long rod. The collector...
- NIST Museum Artifacts
- Variable Sector
- The purpose of a variable sector is to change the intensity of a light beam within the range from an arbitrary 100 percent to zero. For precise visual photometry it is necessary that the adjustment of intensity or brightness be made by simple...
- NIST Museum Artifacts
- Variable Resistor
- A 20-ohm variable resistor.
- NIST Museum Artifacts
- Variable Resistance Transducer Spring
- This spring for a variable resistance transducer was sent to William A Wildhack, Chief of the National Bureau of Standards� Office of Basic Instrumentation, on January 15th, 1951, by B.A. Brice, Head of the Analytical and Physical-Chemical Division...
- NIST Museum Artifacts
- Variable Magnification With Kirkpatrick-Baez Optics for Synchrotron X-Ray Microscopy
- diffraction limit; Kirkpatrick-Baez; microscopy; multilayer mirror; x-ray optics
- We describe the distinction between the operation of a short focal length x-ray microscope forming a real image with a laboratory source (convergent illumination) and with a highly collimated intense beam from a synchrotron light source (Kohler...
- Journal of Research of NIST and Predecessor Publications
- Variable Inductor
- This Variable Inductor was designed and constructed at the National Bureau of Standards in 1911 by Herbert B. Brooks, F.C. Weaver, and Joseph Ludewig. The need for this instrument arose from the Bureau’s work testing current transformers. The...
- NIST Museum Artifacts
- Variability of spectral tristimulus values
- Color-mixture data; spectral data; tristimulus values; variability
- As t he spectral tristimulus values of the ClE Standard Observer System for Colorimetry are measurable quantities, their variabilities should be known. This paper describes a procedure for deriving ""within"" and ""between"" variances and...
- Journal of Research of NIST and Predecessor Publications
- Vapor-liquid equilibrium of carbon dioxide with isobutane and n-butane: Modified leung-griffiths correlation and data evaluation
- butane; carbon dioxide; critical region; data evaluation; vapor-liquid equilibrium
- The Leung-Griffiths model as modified by Moldover and Rainwater is used to correlate high-pressure vapor-liquid equilibria of mixtures of carbon dioxide with n-butane and isobutane. Model correlations are compared against 10 independent...
- Journal of Research of NIST and Predecessor Publications
- Vapor pressures of the methanes
- Journal of Research of NIST and Predecessor Publications
- Vapor pressures of ruthenium and osmium
- The vapor pressures and heats of sublimation of ruthenium and osmium have been measured using a microbalance technique based on the Langmuir method. Heats of sublimation at 298 °K were calculated with the aid of free energy functions. Least squares...
- Journal of Research of NIST and Predecessor Publications
- Vapor pressures of platinum, iridium, and rhodium
- Normal boiling points; iridium; platinum; rhodium; vapor pressure
- The vapor pressures of platinum, iridium, and rhodium have been measured using a microbalance technique based on the Langmuir method. Heats of sublimation at 298 K were calculated with the aid of free energy functions. The least square lines for...
- Journal of Research of NIST and Predecessor Publications
- Vapor pressures of hydrogen, deuterium, and hydrogen deuteride and dew-point pressures of their mixtures
- Journal of Research of NIST and Predecessor Publications
- Vapor pressures and boiling points of some paraffin, alkylcyclopentane, alkylcyclohexane, and alkylbenzene hydrocarbons
- Journal of Research of NIST and Predecessor Publications
- Vapor pressures and boiling points of sixty API-NBS hydrocarbons
- Journal of Research of NIST and Predecessor Publications
- Vapor pressure, latent heat of vaporization, and triple-point temperature of N2O
- Journal of Research of NIST and Predecessor Publications
- Vapor pressure of water at its triple point
- Precision mercury manometer; triple point of water; vapor pressure of water
- The vapor pressure of water at its triple point was measured with exceptionally high accuracy by realizing it with a special apparatus and measuring the pressure with the NBS precision mercury manometer. The vapor pressure apparatus had a system...
- Journal of Research of NIST and Predecessor Publications
- Vapor pressure of palladium
- boiling point; heat; palladium; pressure;
- The vapor pressure and heat of sublimation of palladium were measured using vacuum microbalance technique. The mean heat of sublimation obtained was 89.2±0.8 kcal/mole. Over the temperature range of 1,294 to 1,488 °K the measured vapor pressures...
- Journal of Research of NIST and Predecessor Publications
- Vapor pressure of nitrogen
- Journal of Research of NIST and Predecessor Publications
- Vapor pressure of ammonia
- Journal of Research of NIST and Predecessor Publications
- Vapor pressure formulation for water in range 0 to 100 C. A revision
- Clapeyron equation; saturation vapor pressure over water; steam; vapor pressure; vapor pressure of water; virial coefficients
- In 1971 Wexler and Greenspan published a formulation for the vapor pressure of water encompassing the temperature range 0 to 100C. In this paper a revision is made of that earlier formulation to make it consistent with the definitive experimental...
- Journal of Research of NIST and Predecessor Publications

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