The Babcock Test. 



43 



having been rinsed with hot water, the test bottles are 

 placed in the hot solution in the tank, where they may 

 be left completely covered with the liquid. If the tank 

 is provided with a small faucet at the bottom, the liquid 

 can be drawn off when the test bottles are wanted. A 

 tablespoonful of 

 some cleaning pow- 

 der to about two 

 gallons of water 

 will make a very 

 satisfactory solu- 

 tion ; sal soda, 

 Gold Dust, Lewis 9 

 lye or Babbitt's 

 potash are very 

 efficient for this 

 purpose. The 

 cleansing proper- 

 ties of solutions of 

 any of these sub- 

 stances are in- 

 creased by warm- 

 ing the liquid. The FIG ' 15 ' Tank for cleaning test bottles. 



test bottles must be rinsed twice with hot water after 

 they are taken from this bath. 



An excellent cleaning solution that can be used for 

 a long time, may be made of one-half pound bichromate 

 of potash to one gallon of sulfuric acid. 1 



An arrangement for cleaning a number of test bot- 

 tles at the same time is shown in fig. 16. 2 III shows the 



1 Michels, Am. Cheesemaker, Jan. 1903. 



2 Wisconsin experiment station, bull. 129. 



