The Babcock Test. 



41 



A convenient method of emptying test bottles is shown 

 in the illustration (fig. 12). After reading the fat col- 

 umn, the bottles are placed neck down, in the half-inch 

 holes of the board cover of a five-gallon stoneware jar. 



FIG. 13. Apparatus for cleaning test bottles. A, apparatus in posi- 

 tion; the water flows from the reservoir through the iron pipe b into 

 the inverted test bottle d through the brass tube c, screwed into the 

 iron pipe. B shows construction of the rubber support on which the 

 test bottles rest;/, sink. 



An occasional shaking while the liquid is running from 

 the bottles will rinse off the preciptate of sulfate of 

 lime. A thorough rinsing with boiling hot water is 



