148 Mr. A. Tribe on an Electrochemical Method of 



over, the configuration of this same ion is markedly concave 

 (figs. 2, 2). Further, the configuration of the boundary- 

 line of the negative ion on the first-named side of the ana- 

 lyzer is concave and smaller in magnitude than on its reverse 

 side, where again the boundary-line of the ion is convex. The 

 intermedial space between the ions increases as the analyzer 

 approaches a position at right angles to the right line between 

 the electrodes, and the characteristic boundary configurations 

 become more and more marked. At right angles the positive 

 ion is smaller in quantity, and arranged longitudinally along 

 the centre of the side of the analyzer facing the + elec- 

 trode, while the negative ion on the reversed side is similarly 

 disposed, but generally not so well defined. 



The classes of distribution described in these two last para- 

 graphs are named non-parallel. The dotted lines in the 

 annexed diagram exhibit the boundary-lines and general cha- 

 racteristics of the parallel and non-parallel distributions. 



Character .of distri 

 bution. 

 Parallel 1. 



With shorter edge of analyzer vertical. 



4- ion. — ion. Position of Analyzer. 



Parallel with direction 



of 



energy. 



Non-parallel. \ 



Side in opposition to direction. 



Eeverse. 



. Inclined to direc- 

 tion 45°. 



Parallel. 



With sides of analyzer horizontal. 



Parallel with 

 tion. 



direc- 



f4. 



2\ T on-parallel. •{ 5. 



(a) 



(«) 



Edge (a) in opposition 

 to direction 15°. 



do 45°, 



'■*-. 



do. 7o°. 



(«) 



