54 



MODERN METHODS OF TESTING MILK 



FIG. 23 TEST-BOTTLE RINSER 



the bottle is shaken up and down in order to remove 

 the white calcium sulphate deposited on the bottom 

 of the bottle during the test. Then, when one is ready 

 to clean up all the bottles that have been used, each 

 one is rinsed with 8 or 10 cc. of a solution, consisting 

 of one ounce of potassium bichromate dissolved in 



FIG. 24 TEST-BOTTLE DRAINING-RACK 



one pint of sulphuric acid. Then a test-bottle brush 

 is run once up and down the neck of each bottle, and 

 finally each is well rinsed with hot water. 



