326 



MR. W. C. D. WHETHAM ON THE IONIZATION OF 



cylinder, is attached by means of four arms to a platinum tube which passes out 

 through a wide aperture in the top of the vessi-I. and is rigidly fitted into a longer 

 brass tube (e). The brass sheath is kept in place by ebonite rings (shaded in the 

 drawing), and, with all it supports, is therefore insulated from the platinum vessel. 



Fig. 1. 



A platinum umbrella, attached to the vertical tube, overhangs the opening into the 

 cell, without touching its sides, and thus prevents any dust or other foreign matter 

 from falling into the solution. 



Inside the vertical platinum support carrying the cage is fixed a pierced gold 



