Electro-Meteorological Observations. 



305 



(1. and 2.) of different lengths, were placed at right a^lgles. The 

 longer of these (1.) was graduated into small equi-distf,nt divisions. 

 A movable arm (3.) which was graduated in the same manner, was 

 attached to the short arm, into which was let a bevel, (4.) 



This instrument was attached to the front of the reel stand by 

 means of a screw (8.) on which it could move. 



As soon as the kite was sufficiently elevated to produce an expan- 

 sion of the electrometer leaves, the instrument was adjusted until 

 the small arm became level, and the movable arm was raised until 

 it was parallel with the wire. 



Then as the number of divisions on the movable arm was to 

 the length of wire out, so the number of divisions on the stationary 



Vol. XXXIL— No. 2. 39 



