DAIRY ANALYSIS 



is practically constant, it is evident that 

 by means of an approximate formula 

 any one of the three can be approxi- 

 mately calculated from the other two. 

 A simple formula which gives a very 

 good approximation is : 



where S = Solids not Fat per cent, by 



weight ; 



G = degrees of gravity ; and 



F = Fat per cent, by weight. 



If it is desired to calculate directly 



the Total Solids (T), which consists of 



the sum of the fat and solids not fat, 



3 we ma write 



p 



5 T = S + F = - + 1.2 F + 0.14 



4 



(2) 



As the solids not fat are not generally 

 estimated directly, but are obtained by 

 subtracting the fat from the total solids, 

 the second formula is more useful when 

 the fat is to be calculated from the 

 specific gravity and total solids, and it 

 may be usefully converted to the form 

 F = 0.833! 0.208 G 0.12 . (3) 

 or perhaps more simply 



i.2F = T-|-o.i 4 . . (4) 



Tables for the easy calculation of 

 solids not fat from fat and specific 

 gravity, and fat from total solids and 

 specific gravity are given at the end of 

 the book (pp. 89, 90) . As the method is 

 only approximate the figures are calcu- 

 lated only to the nearest 0.05 per cent. 

 To use these Tables, find in the upmost 



