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Liquid-in-Glass Thermometer Calibration Service

Description: Abstract: This document gives a description of the calibration of liquid-in-glass thermometers at the National Bureau of Standards. The calibration equipment and procedures used at NBS are discussed in detail. Calculations and stem-temperature corrections are shown and a discussion of the sources of error encountered in calibration and estimates of uncertainties is presented.
Date: September 1988
Creator: Wise, Jacquelyn A.
Partner: UNT Libraries Government Documents Department

Formation of Lubricating Films at Elevated Temperatures from the Gas Phase

Description: Abstract: Conventional liquid lubricants, when subjected to temperatures of 250*C and above for extended time in an air atmosphere, degrade rapidly to make large amounts of solid sludge and deposits. Based on boundary lubrication of bearings, these same lubricants, when subjected to 250*C to the melting point of the bearing metal, produce in the micro- to milli-second residence time in the bearing contact enough "friction polymer" to result in good lubrication. This report describes the use of these conventional liquid lubricants delivered in a homogeneous vapor phase where the carrier gas is nitrogen, air or mixtures of these two gases. The lubricants studied include alkyl and aryl phosphate esters, organic acid esters, polyphenyl ethers, and mineral oil.
Date: September 1988
Creator: Klaus, E. Erwin; Duda, J. L.; Naidu, S. K.; Munro, R. G. & Hsu, S. M.
Partner: UNT Libraries Government Documents Department