Circular of the National Bureau of Standards, Issue 440U.S. Government Printing Office, 1942 |
From inside the book
Results 1-5 of 100
Page 128
... addition , more precise values have been ob- tained for the calibration constants of the viscometers used in the original measurements of sucrose solutions upon which the tables were largely based . Incorporating these more precise ...
... addition , more precise values have been ob- tained for the calibration constants of the viscometers used in the original measurements of sucrose solutions upon which the tables were largely based . Incorporating these more precise ...
Page 30
... addition , the location of the chosen reference plane may require several measurements , as already shown . The apparatus for the determination of these various elements consists of a polarizer for producing the oscillation form of the ...
... addition , the location of the chosen reference plane may require several measurements , as already shown . The apparatus for the determination of these various elements consists of a polarizer for producing the oscillation form of the ...
Page 33
... addition to producing an angular separation of the two rays , the prismatic effect spread each of the rays into its spectrum . This latter being undesirable , Rochon added another equal glass prism in reverse position to achromatize the ...
... addition to producing an angular separation of the two rays , the prismatic effect spread each of the rays into its spectrum . This latter being undesirable , Rochon added another equal glass prism in reverse position to achromatize the ...
Page 46
... addition , great sensitivity would be secured because a practically vanishing line would be obtained between the halves of the field , as the small strip of spar need not be over 0.1 mm thick . The device was perfected and used by Bates ...
... addition , great sensitivity would be secured because a practically vanishing line would be obtained between the halves of the field , as the small strip of spar need not be over 0.1 mm thick . The device was perfected and used by Bates ...
Page 54
... addition of a few drops of gallium to 10 or 15 ml of cadmium is found to change completely the texture of the latter , rendering it relatively soft and greatly reducing its tensile strength . Subsequently , it was discovered that upon ...
... addition of a few drops of gallium to 10 or 15 ml of cadmium is found to change completely the texture of the latter , rendering it relatively soft and greatly reducing its tensile strength . Subsequently , it was discovered that upon ...
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Common terms and phrases
alkaline analysis angle axis beam boiling Brix Bureau of Standards C. S. Hudson calculated carbon cell CHCl3 Chem chloride Clerget coefficient color concentration constant containing cooled copper correction crystals determined deut dextrose dilute direct polarization dissolved electrode equation evaporated filter filtrate flask formula glass glycosides grams H. S. Isbell H₂O halfshade heating hydrochloric acid hydrolysis instrument invert sugar invertase Jackson and Gillis lactose lamp lead acetate levulose measurements melting method methyl alcohol mg mg mg mixture molasses mutarotation nicol nicol prism normal weight obtained optical rotation oscillation oxide percent percentage plane polarized polariscope polarized light potassium precipitate prepared prism quantity quartz quartz control plates raffinose reaction reading reagent reducing sugars refracting saccharimeter salts sample sirup sodium specific rotation substance sucrose sucrose solutions Sugar Scale sugar solution sulfate sulfuric acid temperature tion titration tube vacuo volume washed wave length
Popular passages
Page 158 - 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 of the solution should be carefully noted.
Page 181 - Titrate at once with the thiosulphate solution until the brown tinge has become weak, then add sufficient starch liquor to produce a marked blue coloration. Continue the titration cautiously until the color due to free iodin has entirely vanished.
Page 778 - After bringing the solution exactly to the mark at the proper temperature, and after wiping out the neck of the flask with filter paper, pour all of the wellshaken clarified sugar solution on a rapidly acting filter. Reject the first portions of the filtrate and use the rest, which must be perfectly clear for polarization.
Page 250 - In case the sample is too dense to determine the density directly, dilute a weighed portion with a weighed quantity of water, or dissolve a weighed portion and dilute to a known volume with water. In the first instance the per cent of total solids is calculated by the following formula : • WS Per cent of solids in the undiluted material= — • S=per cent of solids in the diluted material.
Page 789 - Receptacles — How sampled. — Sugar in hogsheads and other wooden packages shall be sampled by putting the long trier diagonally through the package from chime to chime, one trierful to constitute a sample, except in small lots, when an equal number of trierfuls shall be taken from each package to furnish the required amount of sugar necessary to make a sufficient sample. In the sampling of baskets, bags, seroons, and mats the short trier shall be used, care being exercised to have each sample...
Page 120 - Add strong ammonium hydroxide with constant stirring until the solution is alkaline to litmus, allow the precipitate to settle, and wash by decantation with water until the wash water gives only a slight test for sulfates with barium chloride solution.
Page 170 - Alkaline tartrate solution. — Dissolve 173 g of Rochelle salt and 50 g of sodium hydroxide in water, and dilute to 500 ml.
Page 155 - Defecate, if necessary, with basic lead acetate in the usual manner, making to volume at the temperature at which the observations are to be made.
Page 177 - By consulting the table it will be seen that the vertical column headed 150 is nearest to Z, 145, and the horizontal column headed 95 : 5 is nearest to the ratio of R to I, 95.1 : 4.9.
Page 783 - Inasmuch as the absorption of sea water or moisture reduces the polariscopic test of sugar, there shall be no allowance on account of increased weight of sugar importations due to unusual absorption of sea water or other moisture while on the voyage of importation.