102 Mr. henly’s Experiments and 
to fupport a wire or piece of metal placed horizontally, 
and curved fo as to bring the ends of it, which fhould 
have blunt points, within half an inch diftance of the 
two tin-foil coatings on one of the furfaces of the glafs. 
On the oppofite fide of the glafs, two wires, bluntly 
pointed, are alfo to be employed; one of thefe is to com- 
municate with the prime conductor, and to throw off the 
electricity from thence upon one of the coatings of tin- 
foil placed contiguous to it ; the other wire is to commu- ' 
nicate with the earth, Handing in a perpendicular direc- 
tion, with the point bent towards and reaching within 
.half an inch of the other coating of tin-foil (on the fame 
fur face of the glafs) to receive the electricity thrown off 
iby that coating, while the oppofite fide is charging. 
EXPERIMENT. 
"The apparatus being perfectly dry (the uncoated part 
K>f the glafs and the frame, &c. fhould be varnifhed), 
clean, and in good order; the plate of glafs fhould be fo 
fixed, that each of the four coatings of tin-foil may come 
within half an inch of the point of the wire oppofed to 
it. The apparatus being thus placed, if a powerful ma- 
chine be worked in a dark room, the electricity will be 
feen to iiTue from the point of the wire in contact with 
?the prime conductor upon one of the tin- foil coatings a 
(fig- 
