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 (1), 
and the top of (I) a brass rod (ID), about 4 mm. in diameter is adjusted 
being insulated from the boxes by means of two amber plugs (R) and 
mh : 
(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 
eylinder acting with the metal cap (C) forms a condenser which in- 
creases the capacity of the electroscope. Upon the side of (D) a brass 
