feme EMirkal Experiments* 
5 * 
DESCRIPTION OF THE ELECTROMETER FOR 
THE RAIN. 
THE rain-eleCfrometer is, in its principle, nothing 
more than an infulated inftrument to catch the rain, and 
by a pith-ball electrometer to fhow the quantity and 
quality of its electricity. 
Fig. 2. reprefents an inftrument of this kind, which I 
have frequently ufed, and after fever al obfervations have 
found to anfwer very well, abci is a ftrong glafs tube 
about two feet and a half long, having a tin funnel de 
cemented to its extremity, which funnel defends part of 
the tube from the rain. The out fide furface of the tube 
from A to b is covered with fealing-wax, as alfo that 
part of it which is covered by the funnel, fd is a piece 
of cane, round which feveral brafs wires are twitted in 
different directions, fo as to catch the rain eafily, and at 
the fame time to make no refiftance to the wind. This 
piece of cane is fixed into the tube, and a flender wire 
proceeding from the former goes through the bore of the 
tube, and communicates with the ftrong wire ag, which 
is thruft into a piece of cork fattened to the end a of the 
tube. The end g of the wire ag is formed into a ring, from 
H 2 which, 
