Circular of the National Bureau of Standards, Issue 440U.S. Government Printing Office, 1942 |
From inside the book
Results 1-5 of 100
Page 7
... taken over long time - intervals these differences are not apparent . Morcover , the con- tribution from each oscillator may change its oscillation form , etc. , more or less gradually throughout the time interval in which it emits . In ...
... taken over long time - intervals these differences are not apparent . Morcover , the con- tribution from each oscillator may change its oscillation form , etc. , more or less gradually throughout the time interval in which it emits . In ...
Page 19
... taken parallel to and perpendicular to the plane of incidence are reflected according to different laws . Such a difference is provided for by the Fresnel equations [ 3 , p . 351 ] , which express the ratios of the reflected amplitudes ...
... taken parallel to and perpendicular to the plane of incidence are reflected according to different laws . Such a difference is provided for by the Fresnel equations [ 3 , p . 351 ] , which express the ratios of the reflected amplitudes ...
Page 20
... taken into consideration . ) Normally , the angle of incidence corresponding to a phase difference of π / 2 would be considered as the polarizing angle , since it is then that the major axis of the oscillation path is parallel to the ...
... taken into consideration . ) Normally , the angle of incidence corresponding to a phase difference of π / 2 would be considered as the polarizing angle , since it is then that the major axis of the oscillation path is parallel to the ...
Page 21
... taken to eliminate them as far as possible if the optical coefficients of metals are determined by this catoptric method . Under the best conditions , the method does not yield results with an accuracy comparing to that of results ...
... taken to eliminate them as far as possible if the optical coefficients of metals are determined by this catoptric method . Under the best conditions , the method does not yield results with an accuracy comparing to that of results ...
Page 26
... taken before and after the reversal is double the small deviation of the principal plane of the polarizer from the vertical axis . Consequently , a setting midway between these settings will yield a match on plane polarized light only ...
... taken before and after the reversal is double the small deviation of the principal plane of the polarizer from the vertical axis . Consequently , a setting midway between these settings will yield a match on plane polarized light only ...
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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.