title: Senftleben-Beenakker thermal conductivity effect apparatus.
abstract: An apparatus for measuring the influence of magnetic fields on the thermal conductivity of gases, the Senftleben-Beenakker effect, is described. Conventional ''cold finger type'' cooling with appropriate cryogenic fluids is utilized with a helium exchange gas chamber to establish the general temperature level of the cell holder. Automatic temperature control of the trim heater maintains the desired temperature to +/-10(-3) degrees C in the 77-300 K range. A concentric cylinder cell adaptable for use with either conventional electromagnet or superconducting solenoid is described. The use of thin Mylar polyester film end seals minimizes cell ''end effect'' corrections and provides a resolution of 5x10(-6) in gas thermal conductivity.
authors.affiliation: E. I. Dupont de Nemours, Inc., Wilmington, Delaware 19899Hudson Engineering, Houston, Texas 77001Chemical Engineering Department, University of Houston, Houston, Texas 77004.
authors.forename: J E
authors.initials: JE
authors.lastname: Vevai
authors.forename: D G
authors.initials: DG
authors.lastname: Elliot
authors.forename: W I
authors.initials: WI
authors.lastname: Honeywell