Tests of Instruments for the Determination, Indication, Or Recording of the Specific Gravities of Gases
U. S. DEPARTMENT OF COMMERCE W. AVERELL HARRIMAN, Secretary NATIONAL BUREAU OF STANDARDS E. U. CONDON, Director NATIONAL BUREAU OF STANDARDS MISCELLANEOUS PUBLICATION M177 TESTS OF INSTRUMENTS FOR THE DETERMINATION, INDICATION, OR RECORDING OF THE SPECIFIC GRAVITIES OF GASES By FRANCIS A. SMITH, JOHN H. EISEMAN, AND E. CARROLL CREITZ Issued January 20, 1947 UNITED STATES GOVERNMENT PRINTING OFFICE WASHINGTON : 1947 For sale by the Superintendent of Documents, U. S. Government Printing Office Washington 25, D. C. - Price $1.00 PREFACE At the request of the American Society for Testing Materials, a critical study was made of the commercial instruments for the deter- mination of the specific gravities of gases. Eleven different instru- ments were studied with the use of 15 test gases of known specific gravities. Determinations were made of the accuracy and reproduci- bility, of the effects of changes of temperature, relative humidity and water content of the surrounding air, and of sources of error and applicable corrections. It is believed that the results herein presented will be of considerable value to those requiring accurate data on the specific gravities of gases. E. U. Condon, Director. ii TESTS OF INSTRUMENTS FOR THE DETERMINATION, INDICATION, OR RECORDING OF THE SPECIFIC GRAVITIES OF GASES By Francis A. Smith, John H. Eiseman, and E. Carroll Creitz ABSTRACT At the request of the American Society for Testing Materials, the National Bureau of Standards completed in 1941 a critical study of instruments available to industry for the determination, indication, or recording of the specific gravities of gases. Instruments were submitted for test by all interested manufacturers.
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