The Babcock Test. 71 



5. MODIFICATIONS OF THE BABCOCK TEST. 



82. The Russian milk test. The same chemical and me- 

 chanical principles applied in the regular Babcock test, are used 

 in the Russian milk test, except that in this case the machine in 

 which the bottles are whirled, and the bottles themselves, are so 

 constructed that the latter can be filled with hot water while 

 the machine is running 1 , thus saving time and the trouble inci- 

 dent to the stopping of the tester and filling the bottles by 

 means of a pipette. The milk-measuring pipette (fig. 28) and 



FIG. 26. The Russian test. 



the acid measure used in the Eussian test are one-half of the 

 ordinary size, and the test bottles are made in two pieces with 

 a detachable narrow graduated stem (see fig. 27). The machine 

 is substantially made of cast iron; it is provided with a speed 

 indicator which shows at any time the number of revolutions at 

 which the bottles are being turned. The accompanying illustra- 

 tions show the apparatus used in this test. When the directions 

 for operating the test are followed closely, the results obtained 

 are accurate and very satisfactory. 



1 A similar arrangement for the regular Babcock test has been 

 suggested by Mitchell and Walker of Kingston (Ont.) Dairy School 

 (see Ont. Dept. of Agriculture, bull. 170). 



