j 86 Mr. Read’s Meteorological Journal 
of copper, each one-eighth of an inch thick ; and, in order 
to ftiffen the rod, as well as conduCt more readily the eledtric 
fluid, one of thofe wires is twitted round the rod to the right 
hand, and the other to the left, as low down as the brafs 
collar at the vertex of the lower funnel H, to which they are 
foldered, in order to render their contact perfeCt. The tin 
funnels HH ferve to defend .the glafles B and F from tne wea- 
ther, which glafles are alfo covered with fealing-wax to rencier 
their inlulation more perfect. At a convenient height from the 
floor, a hole is bored through the wall at I. This hole receives 
a glafs tube covered with fealing-wax, through which a fliong 
brafs wire proceeding from the rod is conveyed into the room, 
where ]uft at the end of the glafs tube it pafles through a two- 
inch brafs ball L, and proceeding a little farther, keeps fuf- 
pended at its extremity a pith ball electrometer K, fo that the 
electrometer may be about twelve inches diftant from the wall. 
On the outfide of the wall there is a wooden box M, to keep 
that end of the glafs tube dry. 
At two inches diftance of the above-mentioned brafs ball L, a 
bell N is fupported by a ftrong wire, which palling through 
another hole made in the wall, is made to communicate, by 
means of a good metallic continuation R, with the moift 
ground adjoining to the houfe. A brafs ball, three-tenths of 
an inch in diameter, is fufpended between the bell N and ball 
L, by a filk thread fattened to a nail O. This ball ferves for a 
clapper, by ftriking between the ball and bell, when the eleCtri- 
cal charge of the rod is fufficiently ftrong. 
P is a fmall table fixed to the wall under the bell and ball, at 
a convenient height above the floor, upon which Leyden bottles 
and other apparatus are occafionally placed. Any perfon verfed 
in the fcience of electricity, will eafily undsrftand that this 
6 apparatus 
