[ 43 ° ] 
full inch ; and I fuppofe the effeCt would have been 
greater, but there being a large fire in the room 
where the experiment was made, on opening the 
door, in order to introduce the pointed wire, which 
was twilled round the infulated rod, I apprehend, 
much of the eleCtrified air was difplaced, by the 
outer air prefling in upon it; and driving it to the 
chimney, &c. 
A pair of balls hanging from my hand, 
near the end of the rod, in the eledirified air , di- 
verged one inch and an half: but being held near 
the other end of the rod, in the uneledlrified aif; 
they diverged only half an inch. I then infulated 
the rubber of my machine, andftuck a longffiarp- 
pointed needle in the back of it. Then hanging 
a chain- from my prime-conduCtor to the table, I 
began to turn the winch; when the air of the 
room, the end of the rod, &c. were prefently af- 
fected: and the balls at the oppofite end of it, in 
the other room, foon feparated considerably more 
than an inch. 
I cannot prevail on myfelf to quit this pleafing, 
yet difficult fubjeCt, without expreffing a wiffi, that 
an eleCtrical machine may be conftruCted, to work 
from ten, to fifty large cylinders, furniffied with a 
prime-conduCtor, batteries, and other apparatus, 
proportionably large ; the whole to be inclofed by 
brick walls, having flews quite round it, (like an 
hot-houfe, for botanic purpofes) to keep the air in 
the room in a due temperature for experiment. 
With fuch a machine as this, properly managed; 
•new, unexpected, and wonderful dilcoveries might- 
be 
