72 MODERN METHODS OF TESTING MILK 



CREAM-TESTING SCALES 



For weighing samples of 

 cream, a set of accurate 

 scales is required. Differ- 

 ent forms are illustrated in 

 Figs. 31 and 32. Scales 

 with agate bearings are 

 much preferable to other 

 .forms, since the agate bear- 

 ings do not rust. Torsion balances and those with 

 steel bearings are liable to rust when kept in damp 



FIG. 31 

 CREAM-TESTING SCALES 





FIG. 32 CREAM-TESTING SCALES 



places, and this in time makes them unreliable for 

 accurate work. The scales should be kept in perfect 

 condition and tested for accuracy from time to time. 



METHOD OF SAMPLING CREAM 



Cream, from which the test sample is to be taken, 

 whether for part of a composite sample or for direct 

 testing, must be made as uniform as possible through- 

 out its mass. The best method of sampling any but 



