[ J 3 6 ] 
conductor, fee Fig. 3, I obferved, that, if it was fo 
charged, as to railc the index, of my electrometer to 
iixty degrees, by bringing the ball, on the wire of 
the thunder-houfe, to half an inch diftance from 
that connected with the prime conductor, the jar 
would be difcharged, and the piece in the thunder- 
hou le thrown out to a confiderabie diftance. Uliug 
a pointed wire, for a conductor to the thunder - 
houfe, in dead of the knob, as in the former experi- 
ment, the charge being the lame, the jar was dif- 
charged lilently, though fuddenly : and the piece, 
was not thrown out of the thunder -houfe. 
EXPERIMENT IV. 
Having made a double circuit to the thunder- 
houfe, the firft by the knob, the fecond by a 
iharp pointed wire, at one inch and a quarter 
diftance from each other, but of exaCtly the fame 
height, fee Fig. 4, the charge being the fame ; al- 
though the knob was brought fn ft under that con- 
nected with the prime conductor, which was raifed 
half an inch above it, and followed by the point, 
at one and a quarter inch diftance, yet no ex- 
plofion could fall upon the knob ; the point drew 
off all the charge filently ; and the piece in the 
thunder- houfe remained unmoved. 
•EXPERIMENT V. 
Having iniulated the jar, and connected, by 
chains, with the external coating, on one fide, 
a knob; and, on the other fide, a fharp* pointed 
wire. 
