348 



BUTTER. 



TABLE LXXXI. 



A deviation of - 36° is accompanied Ijy a Reicliert figure of 16 0. 



-35° ., ., 15-25. 



- 34° ,, ., 14-5. 



- 33° ,, „ 13-75. 

 -32° „ ,, 13 0. 

 -31° ., „ 12-25. 

 -30° „ „ 11-5. 



- 29° ,, „ 10-75. 



Butyro-refractometer. — Zeiss' butyro-refractometer (Fig. 49) 



Fig. 49. — Butyro-refractometer. 



measures the angle of total reflection and is a modification of tte 

 well-known Abbe refractometer. It consists of two prisms of 

 glass, hinged so that they can be separated. The light enters 

 at the bottom, passes through the prisms, and is viewed through 

 a telescope having a fixed scale in the focus of the eye-piece. 

 The prisms are provided with a jacket, through which water, the 

 temperature of which is indicated by a thermometer, is passed. 



