The Bdbcock Test. 



41 



An occasional shaking while the liquid is running from 

 the bottles will rinse off the precipitate of sulfate of 



lime. A thor- 

 ough rinsing 

 with boiling hot 

 water by means 

 of an apparatus, 

 devised by one of 

 us 1 (see Fig. 14), 

 is generally suf- 

 ficient to remove 

 E all grease and 

 dirt, as well as 



FIG. 13. Waste-Acid Jar. acid Solution, 



from the inside of the bottles. When the bottles have 

 been rinsed, they are placed in an inverted position to 

 drain, on a galvanized iron rack, as shown in Fig. 15, 

 where they are kept until needed. The outside of the 

 bottles should occasionally be wiped clean and dry. 



47. The amount of unseen fat that clings to test bottles 

 used for testing milk or cream, is generally not sufficient 

 to be noticed in the results obtained in testing whole 

 milk, but it plays an important part in testing samples 

 of separator skim milk. It may be readily brought to 

 light by making a blank test with clean water in bottles 

 used for testing ordinary milk, which have been cleaned 

 by simply draining the contents and rinsing once or 

 twice with hot water; at the conclusion of the test the 

 operator will generally find that a few drops of fat 



i Farrington. 



