The Babcock Test. 



41 



trusts to his memory for locating the different bottles 

 in which tests are made at the same time. 



46. Cleaning test bottles. The fat in the neck of 

 the test bottles must be liquid when these are cleaned. 



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

 tion ; the water flows from the reservoir through the iron pipe 6 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. 



In emptying the acid the bottle should be shaken in 

 order to remove the white residue of sulfate of lime, 

 etc., from the bottom; if the acid is allowed to drain 

 out of the bottle without shaking it, this residue will 



