I 981 
weigh the Strength of the electrical Effluvia, Vir- 
tue, or Power, by caufing it to act upon a Balance, 
I found, the firft Day, that this Method anfwered 
even beyond my Expectation 3 fo that feveral non- 
electrical Balls placed fuccellively underneath one of 
the Scales, and then imbued with electrical Virtue 
the common Way, would prefently caufe that Scale 
to defcend two, three, four, or five Inches, and feem 
to cleave, for 10 or more Seconds of Time to the fe- 
veral Bodies fo placed underneath, fome having much 
greater Effect than others. Whence it appeared, that 
there was a fufficient Latitude for comparing very 
different Forces, if any fuch there were. At the next 
and only Opportunity I have had fince (my Appara - 
tus being made more commodious), I ufed flat inftcad 
of globular Bodies, and then I found the Effects far 
more confiderable; fbme of them, whofe upper Sur- 
face was about 3 Inches fquare, having attracted and 
held down one Scale, when there were about 200 
Grains Weight in the other. 
Though I am tempted to communicate feme 
Things, which I have already obferved by this means-, 
with much Delight, I referve them at prefent for a 
farther Examination 5 defiring in the mean time, that 
you will communicate or divulge this in fuch man- 
ner as you think proper (only concealing my Name), 
that others, who may have an Inclination, may pur- 
fue and improve the Hint. And, for the Eafe of 
fuch, I muft add, that the. Strings of that Scale which 
is to be afted on, mull be long, and non-eleftrical, 
aiffi, I think, thick 5 that there may be a ready Paff- 
age for the electrical Virtue to run off, as fall as it 
is received. Inftcad of a brafs Scale-pan, I ufed a flat 
Piece of Cork, filed very fmooth and even, efpecially 
on 
