[ 96 ] 
Tab. I. Fig. i. 
A reprefents a thin Piece of Sponge, fo cut as to con- 
tain as large a Superficies as pofllble. This hangs 
by a fine Thread of Silk, upon the Beam B, and 
is exactly balanced by another Thread of Silk at ( D, 
(hung with the fmalleft Lead-Shot, at equal Di- 
ftances, and fo adjufted as to caufe the Index E to 
point at G, in the Middle of the graduated Arch 
F, G, H, when the Air is in a middle State be- 
tween the greateft Moifture and the grcateft Drynefs. 
J. fiiews a little Table or Shelf, for that Part of the 
Silk and Shot which isnot fufpended, to reft upon. 
More Words are, I believe, unnecefiary; and there- 
fore I only beg you'll believe me. 
Feb. 15 . 1745 * 
Yours, &c, 
W. Arderon, 
II. A Letter from to Mr. John Elli- 
cot, F. R. S. of ’weighing the Strength of 
EleSirical Effluvia. 
SIR, 
.&WMarch6. a § y 0U werc th e ft r ft, and indeed the 
J 745- • only Perfon who ever fhew’d me 
any electrical Experiments, and have been fo kind, 
according to your wonted Candour, to affift me 
freely upon this and all other like Occafions ; I think 
it proper to give you this firft Account of what I have 
thought 
