K] 



SACCHARINE PRODUCTS 



123 



Table 9. 



For correction of the readings of the Brix spindle when made at other than the 

 standard temperature, 17. 5° C. 



(For temperatures below 17.5°C. the correction is to be subtracted.) 



Example. — A sugar solution shows a reading of 30.2° Brix at 30°C. To find the 

 necessary correction for the conversion of this reading to the reading which would 

 have been obtained if the observation had been made at 17.5°C., find the vertical 

 column in the table headed 30° Brix, which is the nearest to the observed reading. 

 Follow down this column until the number is reached which is opposite to the tem- 

 perature of observation — in this case 30°. The number found, 0.92, is to be added 

 to the observed reading. 



7 By Means of a Pycnometer. — Official. 



(a) By specific gravity at —^' — Determine the specific gravity of the solution 



20 °c 

 at -|5-" by means of a pycnometer and ascertain the corresponding per cent by 



weight of sucrose from 9. When the density of the substance is too high for a direct 

 determination, dilute and calculate the sucrose content of the original material aa 

 directed under 5. 



(b) By specific gravity at -jf^' — Proceed as directed under (a), the determina- 



17 5°C 20°C 



tions of specific gravity being made at -777? ' instead of at -rr^- Ascertain the corre- 



17.5° 



spending per cent by weight of sucrose from 8. 

 The pycnometer deternaination should not 

 20°C. 

 17.5°- "^ -i^' 



made at any other temperature 



