182 



MODERN METHODS OF TESTING MILK 



Comparison of 

 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: (i) 

 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 



-Quevenne lactometer/" former by .29. The 



relation of the specific gravity scale of a hydrometer 



PIG. 49 COMPARISON OF DIFFERENT 



SPECIFIC GRAVITY SCALES 

 Sis specific gravity scale; Nis New York 

 Board 01 Health lactometer; Q is 



