The Babcock Test. 



71 



t'at in a melted condition until the readings are taken. 

 Most turbine testers are now made with a very conven- 

 ient water reservoir attached to the tester (figs. 22-25). 

 The use of zinc or steel oilers, or perfection oil cans 

 has been suggested as a handy and rapid method of 

 adding hot water to the test bottles, but most operators 

 prefer to add water to the bottles by means of a 

 piece of rubber tubing connected with a reservoir, as 

 shown in the illustrations just referred to. 



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 run- 

 ning, thus saving 

 time and the trouble 

 incident to the stop- 

 ping of the tester and 

 filling the bottles by means of a pipette. The milk-measuring 

 pipette (fig. 28) and 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 pro- 

 vided with a very satisfactory speed indicator which shows at 

 any time the number of revolutions at which the bottles are 

 being turned. The accompanying illustrations show the appa- 



FIG. 26. The Russian test. 



