in the Magnetic Field. 



283 



Table VI. — Action of sulphuric acid upon iron. 



Magnet not acting. 



Magnet 

 acting. 



Magnet not acting. 



Magnet 

 acting. 





Temp. 



Temp. 





Temp. 



Temp. 



Times. 







Times. 

















•' to" 



"e" 





"to" 



"e" 



m 00 8 



21-50 



21-50 



4 m 00 s 



30 °1 2 



29-84 



30 



23-60 



24-25 



4 30 



30-18 



29-86 



1 00 



26-18 



27-15 



5 00 



30-20 



29-83 



1 30 



27-92 



28-60 



5 30 



30-20 







2 00 



28-95 



2961 



6 00 



30-17 





2 30 



29-45 



29-75 



6 30 







3 00 



29-82 



29-80 



7 00 





- - - - 



3 30 



30-00 



29-85 









V. — Experiments with Nitric Acid and Copper. 



In conclusion of this investigation a series of measurements 

 were made by the methods already described, in which pow-* 

 dered copper, such as is obtained by electrolytic deposition, 

 was substituted for iron. The character of the reaction within 

 and outside of the magnetic field was noted and especial atten- 

 tion was paid to the matter of speed and heat of chemical 

 union. The reaction in the field was found to be identical in 

 both respects with that which occurred when the magnet was 

 not in action. The mean of time determinations showed, for 

 instance, the rise of temperature and duration of action to be : 



Within the magnetic field. 

 Rise of temperature =z4°-875 

 Duration = 4 m 04'5 s 



Outside of the magnetic field. 

 Rise of temperature =4 0, 882 

 Duration =4 m 05-6 a 



In these experiments 20 oc of nitric acid and 30 cc of water 

 acted upon 1 gram of copper. Various cursory tests with other 

 metals seemed to indicate that the effects of. the magnet de- 

 scribed in this paper are confined to reactions in which iron is 

 one of the factors. 



The set of experiments described in the preceding paragraphs 

 is to be regarded as preliminary to a more complete investiga- 

 tion of the novel series of effects developed by them. It is my 

 intention to repeat these determinations with a large electro- 

 magnet now in process of construction. The further study of 

 the destruction of the passivity of iron by magnetic action is 

 indeed already well advanced and the results will soon be pub- 

 lished. 



University of Kansas, 

 Lawrence, Kansas, August, 1885. 



