204 DIRECTIONS FOR MAKING THE BABCOCK TEST 



with the scale on a level with the eye, observe the divi- 

 sions which mark the highest and lowest limits of the fat. 

 The fat should be read from the extreme top of the curved 

 upper surface, and not from the bottom or middle of 

 the same. The difference between these divisions gives 

 the per cent of fat directly. The reading can easily be 

 taken to half divisions or to one tenth of one per cent. 



Example If the figures on the necks of the bottles 

 gave the per cent of butter fat, for example, as from o 

 to 3, there would be three per cent. The spaces between 

 the figures represent one per cent, and each space between 

 the lines represents two tenths of one per cent. Thus, if 

 the bottom of the oil in the neck of the bottle stood at 

 the figure 2. and the top of the third fine line above the 

 figure 6, there would be four and six tenths per cent 

 (4.6 per cent). Each per cent represents one pound of 

 butter fat in one hundred pounds of milk. 



Amount of Butter. Butter itself contains several sub- 

 stances besides butter fat, so that the amount of butter 

 shows an increase of from ten per cent to eighteen per 

 cent. Hence, in figuring the amount of butter made, this 

 increase should be added to the amount of butter fat which 

 is shown by the Babcock test. 



QUESTIONS. 



1. If the test reads 4.5, how many pounds of butter fat 

 are there in 100 pounds of that kind of milk? 



2. One cow gives 50 pounds of milk a day, which tests 

 3.6 per cent of butter fat. Another gives 35 pounds of 

 milk a day, which tests 5.8 per cent. Which cow is the 

 more profitable if butter fat is sold? 



