494 



ment places the condenser in the center of the ionisation box and the 

 gold leaf support is on one side of the box thus giving more free space to 

 the gold leaf. 



Through openings in the top and bottom of the electroscope box (E), 

 and the top of (I) a brass rod (D), about 4 mm. in diameter is adjusted 

 being insulated from the boxes by means of two amber plugs (R) and 



nn^ 



(.S). The upper end of the rod (D) is covered by a metal cap (C). The 

 upper opening of the cap is closed by means of an ebonite plug (G). The 

 cap can be removed for charging purposes. The rod (D) may be extended 

 and enlarged by fitting to the upper end a brass cylinder (H). This 

 cylinder acting with the metal cap (C) forms a condenser which in- 

 creases the capacity of the electroscope. Upon the side of (D) a brass 



