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DETERMINATION OF SPECIFIC GRAVITY 



Table 101. Degrees on Quevenne Lactometer Corresponding to 

 Degrees on New York Board of Health Lactometer. 



For temperatures above 60 F. add one lactometer degree for 

 every 3 F. above 60. 



For temperatures below 60 F. deduct one lactometer degree 

 for every 3 F. below 60. 



The New York Board of Health lactometer is used in a similar 

 manner as the Quevenne lactometer. 



Specific Gravity of Cream and Buttermilk. The aerometric 

 or hydrometer method of determining the specific gravity is not gen- 

 erally suitable for cream and buttermilk. The viscosity of the cream 

 and the usual presence of varying amounts of air in cream render 

 the results unreliable. In the case of buttermilk, the chief objection 

 lies in the fact that when this product is fluid enough to afford reason- 

 ably free movement of the lactometer, the curd drops to the bottom 

 rapidly and before a satisfactory reading can be taken; and when 

 the consistency of the buttermilk is such as to prevent the rapid 

 separation of the curd, it is too viscous to permit the hydrometer 



