[ 7 62 1 
When a fharp point is prefented to that atmof- 
phere, it cannot deprive the cloud of its whole quan- 
tity of electricity, except the fharp point be lb near, 
that the cloud may explode upon it ; and, in that 
cafe, the cloud muff have a communication with the 
ground, by means of fome non-electric body. Sup- 
pofe an electrified cloud to have an atmofphere, 
which extends round it to the diftance of 90 feet 
from its furface ; and let that atmofphere be divided 
into three parts A , B , and C, each 30 feet in dia- 
mater : Now if a fharp metalline point [a) ereCted 
on a kite, or otherwile, is placed either vertically or 
horizontally in the molt interior part of the .atmo- 
fphere C, that point will continue to aCt till a quan- 
tity 
