lo6 



THE BABCOCK TEST 



^^> 



€' 



i» 



The neck of the tube contains two openings^ 

 The milk and acid are poured through the larger. 

 The smaller tube is graduated for measuring the- 

 fat. The latest improved bottle is graduated 

 from zero to twenty-five hundredths of one per 

 cent., each division representing one one-hun- 

 dredth of one per cent. 



CLEANING GLASSWARE 



Accurate results can only be obtained when* 

 clean glassware is used, and one of the most 

 common faults among users of the test is the- 

 failure to keep the glassware clean and bright. 

 Injustice often results through neglect in this- 

 matter. If the pipette is not thoroughly cleaned 

 a coating will form inside sufficient to reduce the- 

 capacity of the pipette, thereby making the sam- 

 ple too small, and possibly defrauding a cream- 

 ery patron of several dollars. If the point of the 

 pipette has accidentally or otherwise been brok- 

 en, the capacity will also be reduced, and produce results simi- 

 lar or worse than those resulting from an unclean instrument.. 

 When bottles are not properly cleaned a coating will form 

 inside the neck and the resulting lessened capacity will cause- 

 the fatty column to occupy a greater part of the graduated 

 neck than it should. The result will, in this case, be unjust 

 to the creamery, as the per cent, of fat will appear larger than 

 it actually is. The evil of unclean glassware is not only the- 

 evil of uncleanliness, but it may also seriously affect results. 



There need be no trou])le in keeping glassware ]ii"ight if it is- 

 cleaned as soon as used. Immediately after finishing with 

 the pipette, rinse with cold water, then fill with soap and hot 

 water and shake thoroughly, after which rinse with clean hot 

 water. 



In cleaning test bottles pour out the milk and acid as soon' 

 as the per cent, of fat has been determined and shake thor- 

 oughly while emptying, so that the sediment on the bottom 

 of the bottle may be completely removed. Next prepare a 



Fig. 17. 



