3<D A DAIRY LABORATORY GUIDE 



An illustrative example will show how these 

 formulae operate. Suppose the Q. lactometer read- 

 ing 1 of a sample of milk was 32.5 at 60 F. and the 

 fat reading was 4.2 per cent, what are the solids 

 not fat? 

 Formula= 



I. ^f=S. N. F. .7X4-22.94 

 2.94+32.5=35.44 

 35.44-^-3.8=9.32+ 

 Formulating the above calculation : 

 32 - 5 + 2 - 94 =9.32% S. N. F. 

 9.32+4.2=13.52 total solids. 

 Using formula 2 : 

 i^=S. N. F. 

 32.5+4.2=36.7 

 36.7-^-4=9.17+% S. N. F. 

 Formulating the above calculation : 

 2*$"=9.i7 S. N. F. 

 9.17+4.2=13.37 T. S. 

 Using formula 3 : 



#L+.2f+.i4=S. N. F. 

 32.5-^-4=8.12 



.2X4.2^.84 



8.i2+.84+.i4=9-io S. N. F. 



9.10+4.2=13-30 T. S. 



By modifying Babcock's third formula the total 

 solids may be obtained directly. It is as follows: 



y 4 L+i.2f+.i4=T. S. 



Using the above lactometer and fat readings as 

 an illustration, the formula would give the following 

 results : 



32.5-^4=8.12 



1.2X4.2=5.04 

 8.i2+5.04+.i4=i3-30% S. N. F. 



