On the Magnetic Effect of Electric Convection. 235 



left, showing the top plate to be positive, the E.M.F. being 

 more than 10 volts. The sheet of dielectric was then reversed, 

 and exactly the same effect produced, viz. extension made the 

 top plate negative, and vice versa. It appears, therefore, that 

 polarization of a dielectric may be produced by simple pressure 

 or extension, and hence some part of the mechanical energy 

 expended on the indiarubber during manufacture may remain 

 in the dielectric as electric energy. 



XIX. Reply to Mr. Harold A. Wilson's Article entitled "On 

 the Magnetic Effect of Electric Convection, and on Rowland's 

 and Cremieu's Experiments/' By V. Cbbmibu, Dr. h 



Sciences *. 



MR. WILSON has brought forward two objections of an 

 experimental nature to the results obtained by me. 

 The first of these bears on the experiment regarding the 

 effect which is the converse of the magnetic effect of electric 

 convection. 





It may be briefly stated thus : Owing f<> the construction of 

 the apparatus, the field of the magnet NS, which is excited at 



* Communicated by the Author. 



