80 



Milk and Its Products 



responding to the assumed least specific gravity of 

 milk, or 1.029. 

 If, then, in any 

 given sample of 

 milk the lactom- 

 eter fell to 90, 

 it would indicate 

 the presence of 10 

 per cent of water ; 

 if it fell to 75, of 

 25 per cent of 

 water, etc. This 

 form of lactometer 

 is now known as 

 the common, or- 

 dinary or Board 

 of Health lactom^ 

 eter. A second 

 form of lactometer 

 in common use 

 was devised by 

 Quevenne, and 

 bears his name. 

 The scale of this 

 hydrometer is or- 

 dinarily graduated 

 from 15 to 40, the 

 29 being coinci- 

 dent with 100 up- A B 



On the Ordinary laC- Pig . n . comparison of graduation on lactometer 

 anrl -until stems : A, hydrometer JB, ordinary lactometer; 

 ana Wltn C, Quevenne lactometer. 



