[ 727 ] 
your Fingers, and flop upon your taking them off* 
And this Experiment will look much like Magic, 
even to thofe who are acquainted with the Opera- 
tions of Electricity 5 for if the Perfon who turns the 
Wheel of the Machine, and (lands upon the Cakes, 
be properly inftru&ed: upon your bidding the Gun- 
barrel fnap, he only puts the Toe of his Shoe upon 
the Floor, and it fnaps immediately, and continues 
fnapping as long as he keeps it there ; but if you 
order it to ceafe fnapping, he almoft imperceptibly 
replaces his Foot upon the Cakes, and it ceafes. 
This may be repeated as often and as long as you 
pleafe. 
52. Many Experiments demonftrate, that if the 
Electricity is not ftopt, no Sign of its Prefence, 
either by Fire or Attraction, is obfervable in the 
non electric Bodies fufpended to the Globes : that 
is, although eve.T fo great a Quantity be determined 
by the Globes over thefe Bodies, the Electricity 
paffes off from them pleno rivo to the Floor, from 
whence it came: but if the Electricity is ftopt, it is 
then accumulated upon thefe Non-electrics; but 
this can be done only to a certain Degree, as is ma- 
in fed from a former Experiment. And if, when this 
Power is accumulated, a Man (landing upon the 
Floor touches now-and-then the Non-electrics with 
his Finger, the Electricity, which is here accumu- 
lated, fnaps, and the Fire is always obfervable. But 
this Snapping is nor, when the electrical Power 
paffes off continually, as from a Piece of blunt Wire 
hung to the fufpended Gun-barrel, and the Hand of 
a Man brought near it without touching ; whereby 
the electrical Power becomes vifible, like a fine 
B b b b b blue 
