134 



MODERN METHODS OF TESTING MILK 



Comparison o f 

 the two lactometer 

 scales. In compar- 

 ing the scales of the 

 Quevenne and Board 

 of Health lactom- 

 eters, the following 

 points will make clear 

 their relations: (r) 

 The zero point on 

 both instruments in- 

 dicates the specific 

 gravity of water, 

 that is, i. ooo. (2) 

 On the B. of H. lac- 

 tometer, the 100 di- 

 visions or degrees 

 from o to 100 corre- 

 spond to 29 divisions 

 on the Quevenne. 

 Therefore one de- 

 gree on the B. of H. 

 lactometer c o r r e- 

 sponds to .29 degree 

 on the Quevenne. To 

 convert the B. of H. 

 lactometer reading 

 into that of the 

 Quevenne, multiply 

 the reading of the 

 former by .29. The 

 relation of the specific gravity scale of a hydrometer 



FIG. 50 COMPARISON OF DIFFERENT 



SPECIFIC GRAVITY SCALES 

 S is specific gravity scale; Nis New York 

 Board of Health lactometer; Q is 



