176 



Mr. T. Andrews. 



[June 6, 



I. " Electro-chemical Effects on Magnetising Iron. Part III."* 

 By Thomas Andrews, F.R.SS.L. & E., M.Inst.C.E. Re- 

 ceived May 3, 1889. 



Experiments with Magnetic Polar Terminals. 



In course of an earlier part of this research I made many pre- 

 liminary experiments to investigate the possible electro-chemical 

 effect between the polished end disks or alternate polar terminals of 

 straight round steel magnets when immersed as elements in some 

 electrolytes, only the north arid south terminal planes of each steel 

 magnet being simultaneously exposed to the action of the electrolyte. 



Indications were afforded, under certain conditions, of a tendency 

 on the part of the "N. terminal of the magnet to become from some 

 cause electro-positive to the S. terminal plane. The apparatus, fig. 6, 

 was used in the first series of observations. 



Fig. 6. 



The magnets were placed parallel at some distance apart in an up- 

 right position, the lower end of each magnet, exposed in the solution, 



* Parts I and II are printed at vol. 42, p. 459, and vol. 44, p. 152. 



