126 



MODERN 



t.eio 



:methods of testing milk 



Comparison o f 

 the two lactometer 

 scales. — In compar- 

 ing the scales of the 

 Ouevenne 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 w a t e r, 

 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 Ouevenne. To 

 convert the B. of H. 

 lactometer reading 

 into that of the 

 Ouevenne, multiply 

 the reading of the 

 former by .29. The 

 relation of the specific gravity scale of a hydrometer 



N 



FIG. 50 — COMPARISON OF DIFFERENT 



SPECIFIC (-.RAVITY SCALES 

 .S"is specific gravity scale; A''is New York 

 Board of Health lactometer; <2 is 

 yuevenne lactometer. 



