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" If the analyst is in doubt as to the completion of the hydrolysis, allow a portion of the solution to remain for several hours and again polarize. If there is no change from the previous reading, the inversion is complete, and the reading and temperature... "
Circular of the National Bureau of Standards - Page 158
1942
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Bulletin - Bureau of Chemistry, Issues 100-109

United States. Bureau of Chemistry - 1906 - 1020 pages
...at that temperature. This reading must be multiplied by two, which gives the invert reading. In case it is necessary to work at a temperature other than 20° C., which is allowable within narrow limits, the volumes must be completed and both direct and invert polarizations...
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Bulletin - Bureau of Chemistry, Issue 107

United States. Bureau of Chemistry - 1908 - 300 pages
...at that temperature. This reading must be multiplied by two, which gives the invert reading. In case it is necessary to work at a temperature other than 20° C., which is allowable within narrow limits, the volumes must be completed and both direct and invert polarizations...
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Official and Provisional Methods of Analysis, Association of Official ...

Association of Official Analytical Chemists. Committee on Revision of Methods - 1910 - 304 pages
...at that temperature. This reading must be multiplied by two, which gives the invert reading. In case it is necessary to work at a temperature other than 20° C., which is allowable within narrow limits, the volumes must be completed and both direct and invert polarizations...
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Circular of the Bureau of Standards, Issues 41-45

1913 - 666 pages
...in a aoo-mm tube. Allow the solution to remain in the tube for an hour and repeat the polarization. If there is no change from the previous reading, the inversion is complete. The reading and temperature of the solution are then carefully noted. The reading is corrected for...
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Bulletin, Volumes 30-37

Philippines. Bureau of Agriculture - 1914 - 1124 pages
...at that temperature. This reading must be multiplied by two, which gives the invert reading. In case it is necessary to work at a temperature other than 20° C, which is allowed within narrow limits, the volumes must be completed and both direct and invert polarizations...
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The Chemistry and Analysis of Drugs and Medicines

Henry Corbin Fuller - 1920 - 1100 pages
...maintaining a temperature of 20° C. This reading must be multiplied by 2 to obtain the invert reading. If it is necessary to work at a temperature other than 20° C., which is allowable within narrow limits, the volumes must be completed and both direct and invert polarizations...
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Journal of the Association of Official Agricultural Chemists, Volume 3

Association of Official Analytical Chemists - 1920 - 656 pages
...in a 200 mm. tube. Allow the solution to remain in the tube for an hour and repeat the polarization. If there is no change from the previous reading the inversion is complete; then the reading and temperature of the solution are carefully noted. The reading is corrected for...
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Official and Tentative Methods of Analysis, Volume 1

Association of Official Analytical Chemists - 1920 - 438 pages
...in a 200 mm. tube. Allow the solution to remain in the tube for an hour and repeat the polarization. If there is no change from the previous reading, the inversion is complete, whereupon the reading and temperature of the solution are carefully noted. Correct the reading for...
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Technical Methods of Analysis as Employed in the Laboratories of Arthur D ...

Roger Castle Griffin - 1921 - 696 pages
...and water jacket, keeping at 20° C. This reading must be doubled to obtain the invert reading. If necessary to work at a temperature other than 20° C., which is allowable within narrow limits, the volumes must be completed and both direct and invert polarizations...
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Official and Tentative Methods of Analysis, Parts 1-2

Association of Official Analytical Chemists - 1925 - 582 pages
...dilute to 100 cc. at 20°C. Mix well and polarize at 20°C. in a 200 mm. tube. If the analyst is in doubt as to the completion of the hydrolysis, allow...from the previous reading, the inversion is complete, and the reading and temperature of the solution should be carefully noted. If it is necessary to work...
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