•n. [ 455 ] 
By experiment it alfo appears, that the quantity 
of electric fluid, at every explofion, will be propor- 
tionate to the quantity of coated glafs, either as to 
the fize of t the coated phial, or to the number of 
phials added. For example, if the phial D has 
half of the coating on each fide of the glafs taken 
off, the explofion will happen after half the number 
of turns of the wheel, at any of the above diftances ; 
and if a phial, with twice the quantity of coated 
glafs, is employed inftead of D, the number of 
turns of the wheel will be double j the lame will 
happen if two coated phials, each equal to D, are 
ufed ; and if three phials, the number of turns will 
be triple, &c. ' 
The phial D, ufed in the following experiments, 
contains about 80 fquare inches of coating on the 
infide, and alfo on the outfide of the glafs; the 
mouth being flopped with wood, prepared like the 
pillar, and the coating not too near the mouth of 
the phial, to .prevent the eleCtric fluid’s waiting, and 
thereby the phial may be more fully charged. 
As K is part of the conductor, and of M the elec- 
trometer, the diflance between them is the diflance 
of theiele&rometer from the conductor ; whence it 
will be readily underftood, when 1 relate the diflance 
of the electrometer, in any experiments. For ex- 
ample, the electrometer at 20, that is, M, is 20 turns 
of the fcrew diftant from K, or 4.® of an inch. 
That lightning and electricity are of very near 
affinity, if not the lame, evidently appears from the 
many difcoveries you have made ; and as the follow- 
ing experiments tend to confirm the fame, as well as 
7 to 
