19. Dr. Weidlein has been prominently and actively identified with the Institute for over 40 years, serving as a senior fellow 1912-t6, and then as an executive staff member from 1916 to 1951, when he was made President. He is noted internationally as a scientist, research administrator, and author. Following his retirement he will spend several months in Europe on a Federal Government mission. Dr. Weidlein will continue to serve the Institute as a member of the Board of Trustees and will be available in an advisory capacity in the administration of research programs.ALBERT H. COOPER has joined the American Hard Rubber Co., New York City, as assistant to W. M. Bergin, Director of Research & Development. A well-known authority on organic and inorganic chemicals, Dr. Cooper will devote the major part of his time to furthering American's accelerated chemical research and allied production programs. He is the owner and manager of Pilot Engineering Co., industrial consultants on plant design and production problems; he also is head of the Dept. of Chemical Engineering at Pratt Institute in Brooklyn. J. J. LANDER has resigned as chemist with the Naval Research Lab., Washington, D. C., to assume the position of Director of Research of the Storage Battery Division, Electric Auto-Lite Co., Toledo, Ohio. J. S. DEWAR recently was promoted to President of National Carbon Co. Ltd., Toronto, Ont., Canada. He has the distinction of being the youngest chief executive in the history of the company.

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The low-pressure viscosity and heat-transfer parameters —thermal conductivity and Prandtl number—are tabulated for air, nitrogen, oxygen, hydrogen, argon, carbon monoxide, carbon dioxide, nitric oxide, steam, and helium. The values reported are based on recent critical correlations of the thermodynamic and transport properties of these gases at the National Bureau of Standards. The properties are tabulated for atmospheric pressure and extend from 100 K (180 R) to as high as 2000 K (3600 R) in some instances. The effect of pressure on the viscosity is presented in tabular form for oxygen, nitrogen, hydrogen, steam, carbon dioxide, and argon for pressures up to 100 atm in the experimental range of temperatures. The Prandtl numbers for air given in this work are compared with existing published and unpublished values which are in extensive use. Plots are included showing the scatter among the experimental data and deviations between them and the tabulated values. They present a very clear picture of the extent and concordance of the experimental data. A nomogram is included for obtaining fractional powers of the Prandtl number.

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