THE BABCOCK TEST 



37 



or more tests, are probably the most convenient where 

 many samples are to be tested at the same time. 



FIG. 12 

 ACID-BURETTE AND STAND 



FIG. 13 

 AUTOMATIC BURETTE 



THE CENTRIFUGAL MACHINE, OR TESTER 



The centrifugal machine used in the Babcock test 

 is commonly called the Babcock tester. Various forms 

 have been devised, varying in size from those adapted 

 for a single duplicate test up to the needs of large fac- 

 tories. The designs of recent years are much superior 

 to the early forms. Some of the different types are 



