[ *6 ] 
IV. Defer ip tion of a new Electrometer. In a Letter from the 
Rev. Abraham Beimet, M. A. to the Rev. Jofeph Prieflley, 
LL.D. F. R. S. 
Read December j , 1786. 
R E V. SI R, Wirkfworth, Sept. 14, 1786. 
I SEN D you a defeription of my eleCtrometer, which, hav- 
ing the honour of your approbation, may be communicated 
to the Royal Society. (See Tab. II. fig. 1. and 2. which repre- 
fent two fe&ions of the inftrument.) 
It confifts of two flips of leaf gold, a a, fufpended in a 
glafs h. The foot c may be made of wood or metal ; the cap 
d of metal. The cap is made flat on the top, that plates, 
books, evaporating water, or other things to be electrified, 
may be conveniently placed upon it. The cap is about an inch 
wider in diameter than the glafs, and its rim about three-quarters 
of an inch broad, which hangs parallel to the glafs, to turnoff 
the rain and keep it fufficiently infulated. Within this is ano- 
ther circular rim, about half as broad as the other, which is 
iined with filk or velvet, and fits clofe upon the outfide of the 
glafs ; thus the cap fits well, and may be eafily taken off to 
repair any accident happening to the leaf gold. Within this 
rim is a tin tube e , hanging from the center of the cap, fome- 
what longer than the depth of the inner rim.' In the tube afmall 
peg f is placed, and may be occafionally taken out. To the 
