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Twelfth annual conference on weights and measures, 1919
May,
1920.]
U. S.
BUREAU
OF STANDARDS
NOTES.
659
and thermal reactions have been investigated. Additional phases, such as method of manipulation, time, temperature, etc., were found to exert definite influences’ upon the materials. A number of commercial alloys, together with some special alloys, were tested. The thermal expansion of amalgams was found to be considerably greater than the expansions of normal teeth. The apparatus generally used in testing these materials was found to be unsuited for accurate observations. More suitable instruments were selected and it is thought that the data supplied in this paper are of the highest accuracy and may be safely used as the basis for clinical interpretations. The paper includes 25 photographs or drawings and three tables setting forth details of the investigation. TWELFTH
ANNUAL
CONFERENCE ON MEASURES, IgIg.*
WEIGHTS
AND
[ABSTRACT.]
THE Annual Conference on Weights and Measures is a national organization composed of State and local weights and measures officials throughout the United States. This body meets annually at the Bureau of Standards, Washington, D. C., for the purpose of discussing and solving problems relating to weights and measures, such as uniform legislation, rules and regulations and methods of enforcement of weights and measures laws, specifications and tolerances for all commercial apparatus, and the proper inspection a,nd test of apparatus, etc. The present meeting was the twelfth one held, and the first since 1916, the sessions having been discontinued during the war. This repo,rt, which is a stenographic record of the proceedings, includes all papers read and resolutions adopted. Perhaps the most important single accomplishment of this Conference was the discussion upon and the tentative adoption of a set of specifications and tolerances for liquid-measuring pumps, especially those used in the sale of gasoline, kerosene, etc. It was agreed by the members that these should be thoroughly studied and tried out in the field and that final action upon them should be taken at the next meeting. The unsatisfactory condition of liquid-measuring pumps in all ’Miscellaneous Publication No. 41.
U. S.
BUREAU
OF STANDARDS
NOTES.
[J. F. I.
parts of the country rendered action on this important subject imperative if the purchaser was to receive the correct amounts. Consideration was also given to a number of other subjects of importance, including the progress made in the various’ States and cities; the necessity of the Federal regulation of type of apparatus; the proper method of sale o,f ice and wood; the testing of railroad track and mine scales ; the marking of wrapped hams and bacon with the net weight; the standardization of shipping containers; and the adoption of the metric system of weights and measures. THE
EXTRACTION
OF
RUBBER
GOODS.”
By S. W. Epstein and B. L. Gonyo. [ABSTRACT.]
THIS
paper makes a complete study of the various extracts as determined in the analysis of rubber goods. The advantage of the use of mixed solvents, namely acetone-carbon bisulphide and acetone-chloroform, over the methods previously employed is described with considerable detail. A mixture of jj per cent. carbon bisulphide and 45 per at 34.25’ C., is cent. acetone by volume, boiling constantly adopted rather than the acetone-chloroform mixture because of the less solvent effect of the acetone-carbon bisulphide mixture on the rubber. This makes it possible to eliminate the extraction with chloroform and to determine free sulphur directly in the extract, provided the bisulphide is properly purified before use. A large number of figures are presented to show the distinct advantage of the use of a mixed solvent over the separate extractions with acetone and chloSroform, particularly in cheap compounds when the material is not all removed by the separate extractions. THE.
DOUBLE POLARIZATION METHOD FOR THE TION OF SUCROSE AND THE EVALUATION THE CLERGET DIVISOR’”
ESTIMAOF
By Richard F. Jackson and Clara L. Gillis. [ABSTRACT.] A
exact
SINGLE polarization of a sugar mixture fails to give an indication of the quantity of sucrose since the observed
*Technologic Paper No. 162. lo Scientific Paper x0. 375.
1920.]
U. S.
BUREAU
OF STANDARDS
NOTES.
659
and thermal reactions have been investigated. Additional phases, such as method of manipulation, time, temperature, etc., were found to exert definite influences’ upon the materials. A number of commercial alloys, together with some special alloys, were tested. The thermal expansion of amalgams was found to be considerably greater than the expansions of normal teeth. The apparatus generally used in testing these materials was found to be unsuited for accurate observations. More suitable instruments were selected and it is thought that the data supplied in this paper are of the highest accuracy and may be safely used as the basis for clinical interpretations. The paper includes 25 photographs or drawings and three tables setting forth details of the investigation. TWELFTH
ANNUAL
CONFERENCE ON MEASURES, IgIg.*
WEIGHTS
AND
[ABSTRACT.]
THE Annual Conference on Weights and Measures is a national organization composed of State and local weights and measures officials throughout the United States. This body meets annually at the Bureau of Standards, Washington, D. C., for the purpose of discussing and solving problems relating to weights and measures, such as uniform legislation, rules and regulations and methods of enforcement of weights and measures laws, specifications and tolerances for all commercial apparatus, and the proper inspection a,nd test of apparatus, etc. The present meeting was the twelfth one held, and the first since 1916, the sessions having been discontinued during the war. This repo,rt, which is a stenographic record of the proceedings, includes all papers read and resolutions adopted. Perhaps the most important single accomplishment of this Conference was the discussion upon and the tentative adoption of a set of specifications and tolerances for liquid-measuring pumps, especially those used in the sale of gasoline, kerosene, etc. It was agreed by the members that these should be thoroughly studied and tried out in the field and that final action upon them should be taken at the next meeting. The unsatisfactory condition of liquid-measuring pumps in all ’Miscellaneous Publication No. 41.
U. S.
BUREAU
OF STANDARDS
NOTES.
[J. F. I.
parts of the country rendered action on this important subject imperative if the purchaser was to receive the correct amounts. Consideration was also given to a number of other subjects of importance, including the progress made in the various’ States and cities; the necessity of the Federal regulation of type of apparatus; the proper method of sale o,f ice and wood; the testing of railroad track and mine scales ; the marking of wrapped hams and bacon with the net weight; the standardization of shipping containers; and the adoption of the metric system of weights and measures. THE
EXTRACTION
OF
RUBBER
GOODS.”
By S. W. Epstein and B. L. Gonyo. [ABSTRACT.]
THIS
paper makes a complete study of the various extracts as determined in the analysis of rubber goods. The advantage of the use of mixed solvents, namely acetone-carbon bisulphide and acetone-chloroform, over the methods previously employed is described with considerable detail. A mixture of jj per cent. carbon bisulphide and 45 per at 34.25’ C., is cent. acetone by volume, boiling constantly adopted rather than the acetone-chloroform mixture because of the less solvent effect of the acetone-carbon bisulphide mixture on the rubber. This makes it possible to eliminate the extraction with chloroform and to determine free sulphur directly in the extract, provided the bisulphide is properly purified before use. A large number of figures are presented to show the distinct advantage of the use of a mixed solvent over the separate extractions with acetone and chloSroform, particularly in cheap compounds when the material is not all removed by the separate extractions. THE.
DOUBLE POLARIZATION METHOD FOR THE TION OF SUCROSE AND THE EVALUATION THE CLERGET DIVISOR’”
ESTIMAOF
By Richard F. Jackson and Clara L. Gillis. [ABSTRACT.] A
exact
SINGLE polarization of a sugar mixture fails to give an indication of the quantity of sucrose since the observed
*Technologic Paper No. 162. lo Scientific Paper x0. 375.