THE POLARISCOPE AS APPLIED TO SUGAR ANALYSIS. 



External Form of Polariscopes. The instruments most 

 frequently met with in sugar houses are made by Schmidt & Haensch, Fric, and 

 Peters. Fig. 237 shows a late pattern adopted by the first-named firm : at the 

 end next the lamp is a tube with a diaphragm in which may be inserted at will 



a ground glass disc ; by the use of this, equal illumination can be obtained when 

 using an electric light or incandescent mantle. At B is a chamber serving to 

 hold a cell which may be filled with a dilute solution of potassium bichromate ; 

 at P is contained the polarizing apparatus ; at It is the trough of the instru- 

 ment designed for the reception of the tube containing the sugar solution , 



435 



