OXIDATION OF ARSENIC IN DIPPING BATHS. 5 



The diagrams show, first, that all vats tend to become oxidized im- 

 mediately or shortly after they have been put into use. This tendency 

 may persist indefinitely, and the lines may thus spread farther and 

 farther apart. Or, secondly, in some cases after a certain period of 

 use, the first tendency to become oxidized may become diminished or 

 overbalanced by a tendency in the opposite direction, so that the lines 

 thereafter remain parallel or even converge. In a general way the 



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Flo. 2.— Diagram (vats Q to K ho in e iai | es in idjation of arsenic in dipping baths. 



size of the figure of use (the diagrams for 1913 are purposely arranged 

 in the descending order of the average figures of use of the vats) evi- 

 dently measures the rapidity with which the first stage, that of 

 oxidation, progr< ad also the rapidity with which the second 



■/<•, thai of reduction, first appears and the extent to which it 

 thereafter inhibits or overcomes the original tendency to oxidation, 

 Unfortunately, through failure of the field agents of the bureau to 



