

THE CONCENTRATION OF THE SYRUP TO MAS8ECUITE. 



170 



FIG. 197. 



corresponding to the divisions of a thermom- 

 eter ; on A, opposite to the temperature 

 divisions on C, are marked the corresponding 

 pressures or vacua at which water boils. The 

 sliding scale B is graduated so as to connect 

 the elevation of the boiling point with the 

 amount of sugar present, on the same basis 

 as the divisions in the scale C. A deter- 

 mination is actually made as under. 



The vacuum in the pan is 28*0 inches 

 and the temperature is 140 F. The zero on 

 the scale B is placed opposite 28*0 on the 

 scale A; the division on the scale C corre- 

 sponding to a temperature of 140-0 F. is 

 then noted, and opposite this on the scale B 

 is the division 89'9, i.e., the boiling mass 

 contains apparently 89 -9 per cent, of sugar. 



It may at once be stated that it is only 

 bodies in solution that affect the boiling 

 point, and that sugar that has crystallized out 

 has no effect at all ; it is only then with 

 masses boiled string-proof that the apparent 

 sugar percentage of the whole mass is given ; 

 in other cases it is the apparent sugar per- 

 centage of the mother liquor. The scales in 

 the brasmoscope are calculated on a sugar 

 basis, and give only the apparent percentage 

 of total solids expressed as sugar, exactly as 

 the Brix spindle gives also apparent total 

 solids ; actually the non-sugar causes weight 

 for weight a greater elevation of the boiling 

 point than does the sugar, so that the brasm 

 oscope indication will always be higher than 

 the true total solids, and this will be the 

 more pronounced the impurer the mass that 

 is being tested. 



Application of the Brasmoscope. The 

 simplest instance of the use of the brasmo- 

 scope lies in its application to low products 

 boiled string-proof; here no sugar separates 

 in the pan as crystals, and the indications of 

 the instrument will now refer to the Brix* 



Brix in what follows is used as synonymous with the true total solids. 

 363 



