The Babcock Test. 



51 



Fig. 20 (A), or as one straight piece of about three inches 



long. 



The wire serves as a handle for lowering the measure 



into the neck of the test bottles. If the wire is attached 



as shown in Fig. 20 (A), 

 a string can be fastened 

 to the loop for holding 

 the measure in the 

 proper place in the test 

 bottle. 



When a test bottle is 

 to be calibrated by this 

 standard measure, it is 

 filled with water to the 

 zero mark on the neck 

 of the bottle. The water 

 adhering to the neck is 

 carefully removed with a 

 strip of blotting paper, 

 and the measure (A), is 

 then lowered into the 

 test bottle, as shown in 

 (B), to the point where 



\ 



B 



the wire loop is attached. 

 If the water rises from 

 to 10 on the neck when 

 the point of the measure 

 is also at ten, the scale is 



FIG. 20. (A) Trowbridge calibrator as correct. If greater vari- 

 used in test bottle (B). (C) Nafls modi- 

 fication of (A). ations than .2 of one per 



cent, occur, the bottle should be rejected. 



The diagram (C), shows how one of these testers may 

 be made in two sections, and the accuracy of the 5 as well 



