AUTOMATIC BURETTE. 



Automatic measuring ap- 

 paratus and burettes may 

 be also used for measuring 

 the acid and amyl alcohol. 



The author has devised a 

 burette specially for the 

 measurement of sulphuric 

 acid and other corrosive 

 liquids. It has been found, 

 in practice, that ordinary, 

 burettes are liable to be 

 filled to overflowing, and 

 that considerable incon- 

 venience is caused by 

 spilling strong sulphuric 

 acid. 



An ordinary burette with 

 a three-way tap is used, and 

 to the tube, for filling from 

 the bottom, a wider tube, 

 J inch in diameter and 3 

 inches long, is fused. An 

 india-rubber cork is inserted 

 in this, and through it is 

 passed a long glass tube 

 bent as a syphon, which 

 serves to convey the acid 

 from a stock bottle above. 



In the top of the burette 

 an india-rubber cork is 

 fixed, through which passes 

 a tube going almost to the 

 top of an air chamber of 

 glass ; to the bottom of the 

 air chamber a glass tube of 

 small bore passes upwards 

 so far as just to enter into 

 the stock bottle. 



The illustration (Fig. 15) 

 will make the construction 

 clear. 



The conditions necessary 

 for satisfactory working 

 are : 



1. The capacity of air 

 chamber and tube leading 



Fig. 15. Automatic Burette. 



