850 Mr. nairn e’s Experiments to Jhew the 
and difcharging it on the point, as in the laft experiment, 
was now attracted down to the artificial cloud there re- 
maining, not ftriking to the point, or returning to it fa 
long as the artificial cloud continued to be charged. 
OBSERVATION. 
By the twenty-third experiment we fee, that if our 
cloud is fixed at a certain diftance between the arti- 
ficial cloud and the point, the fixed cloud, at the in- 
ftant it receives the electric fpark, diredtly difcharges it 
again on the point. But in the twenty-fourth experi- 
ment, where there is no other alteration than making the 
cloud moveable on its axis, the diftanees being exa£tly 
the fame, the end of the cloud then recedes from the 
point and will not ftrike to it. This twenty-fourth expe- 
riment is much more agreeable to nature than the 
twenty-third, for clouds are not fixed but floating bodies. 
In order to fee the effe£t of rods terminating with 
balls of different fizes, or terminating with a point, mov- 
ing fwiftly under my artificial cloud, I made ufe of the 
following apparatus. 
In fig. 7 . h is a hollow tube of wood covered with tin- 
foil, with a heavy weight fattened to one end of this 
tube; and at about three inches above the weight was 
1 
an 
