TESTING CREAM BY THE BABCOCK TEST 



79 



bearings do not rust. Bal- 

 ances with parts liable to rust 

 when kept in damp places 

 become in time unreliable 

 for accurate work. The 

 scale should be kept in per- 

 fect condition and tested for 

 accuracy from time to time, 



by comparing with some balance or scales of known 

 accuracy. Scales sensitive to one-tenth and one-twen- 

 tieth of a gram can be obtained. 



FIG. 31 

 CREAM-TESTING SCALES 



310 CREAM-TESTING SCALES 



THE SAMPLING OF CREAM 



When cream to be tested is fresh and easily made 

 uniform throughout, its mass by simple mixing or pour- 

 Mag, it is not difficult to secure a representative sample. 

 But, with the introduction of the method of separating 

 cream on the farm and delivery to shipping-stations 

 or through cream-collectors, conditions are often intro- 

 duced which complicate seriously the matter of obtain- 

 ing representative samples. The subject will be dis- 

 cussed under the following divisions : ( i ) Farm-sepa- 



