The Bahcock Test. 



43 



drops of fat will collect in the neck of the bottles, some- 

 times enough to condemn a separator. 



Boiling hot water will generally clean the grease from 

 glassware for a time, but all test bottles should, in ad- 

 dition, be given an occasional bath in some weak alkali 

 or other grease-dissolving solution. Persons doing con- 

 siderable milk testing will find it of advantage to pro- 

 vide themselves with a small copper tank, fig. 15, 

 which can be filled with a weak alkali-solution. After 

 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' 

 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 



Tank tor cleaning test bottles. 



