312 



MILK AND CREAM TESTING 



division on the whole milk bottles have a value of 0.2 per cent 

 (Fig. 111). 



Calculating the Fat in Milk. — Assuming that the milk to be 

 tested had been thoroughly stirred before sampling and that the 

 reading on the test bottle shows 4 per cent, how many pounds 

 of fat are there in the total quantity ? It must be remembered 

 that the words per cent or the sign % indicates hundredths, 

 therefore in multiplying it is necessary to multiply the per- 

 centage figure by one hundred, which will make 4.0 per cent read 



Fig. 106. — The control of temperatures is half the battle in Babcock milk testing. 

 With some makes of testers a common lamp may be used to keep the samples warm. Excel- 

 lent work can be done even in a cold room with such an attachment. 



0.04, and likewise a reading of 3.7 per cent would be written 

 0.037. 



If the cow has yielded 20 pounds of milk which tests 4 per 

 cent fat, there are in that quantity of milk, then, 20 times 0.04, 

 which equals 0.8 i:)ound of fat. Likewise, 40 pounds testing 

 3 per cent fat contains 1.2 pounds of fat (40 times 0.03 equals 

 1.2) ; and 20 pounds of milk testing 6 per cent fat also has in it 

 1.2 pounds of fat (20 times 0.06 equals 1.2). 



A ten-gallon can of milk weighs net about 85 pounds. If it 



