The BabcocJc Test. 



43 



themselves with a small copper tank, which can be filled 

 with a weak alkali-solution (Figs. 16 and 17). After 

 having been rinsed 

 with hot water, the 

 test bottles are placed 

 in the hot solution 

 in the tank, where 

 they may be left 



, FIG. 15. Draining-rack for test bottles. 



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 

 ofSavogran to about 

 two gallons of wa- 

 ter will make a very 

 satisfactory clean- 

 ing solution ; sal 

 soda, Gold Dust, 

 Lewis' lye or Bab- 

 bitt's potash are 

 equally efficient. 

 The cleansing pro- 

 perties of solutions 

 of any of these sub- 

 stances are i n- 

 creased by warrn- 



FIG. 16. Tank for cleaning test bottles. ing the 1 iquid. The 



test bottles must be rinsed twice with hot water after 

 they are taken from this bath. 



