456 Mr. swift's Account of ' fome 
are charged and differently charged, that is, the one pofi- 
tively or plus , the other negatively or minus , as foon as 
the cylinder is put in motion by turning the wheel; 
though, perhaps, this will not be doubted by any perfons 
converfant in eleCtrical experiments, unlefs they have 
been fully perfuaded, that the eleCtric matter cannot be 
excited without connecting the machine with the earth, 
which is not the cafe in this apparatus, for the glafs cy- 
linder and both conductors are infulated. 
1 . When the cylinder moves, and a body approaches 
the prime conductor, fitch body will draw a fpark from . 
that conductor at the fame diftance, and confequently of 
the fame length-as will be drawn from the approaching 
body by the anti-conduCtor. And a pith ball is equally 
attracted by both,, which fufficiently flrews, that both 
conductors are charged or electrified. , 
2. The following common experiments will fhew, 
that they are differently electrified. 
I take a wire with a fmall piece of cocoa vmod, about 
one inch and a half long, pointed, fattened to one end of 
the wire, and connecting the other, end to the anti-con- 
duCtor; as foon as a conducting body approaches it there 
is a bright fpark refembling a ftar, which appears to 
fettle upon the end or point of the wood ; but when the 
wire is connected with the prime conductor, there iflues 
3 from 
