Obfervations on a new Electrical Machine . - 2 .i 
above mentioned, I think it unneceffary to recite them. 
I have like wife omitted to give a drawing; as to electri- 
cians, I apprehend, this paper will be intelligible without 
one; and. to thofe who have not confklered the fubject 
I imagine, it would be of very little, if indeed of any ufe 
u hatevei. the fame difficulty which occurred to Dr. 
franklin, in his analyfis of the Leyden bottle, may be 
iaid to occur alfo in this apparatus, viz, it is hard to 
lay how, or where this electricity is depoiited, there is fo 
much of it; and it is fo eafily put in adion, that 1 am 
Itill further confirmed in an opinion that I have lono- 
entertained, viz. that the flighted: friaion between bodied 
of every kind, in every fituation, may difturb the elearic 
matter contained in them, though this effea be imper- 
ceptible to us, having no elearometer nice enough to dif- - 
cover.it. I .am, See . . 
In the month of March lafl, I repeated Mr. grey’s 
experiment with the. cone of fulphur and the glafs; 
and find that, ,on feparating thefe bodies, the l'ulphur 
hath hitherto u) always acted as a ftrong negative 
electric. Mr. wilcke, in repeating this experiment, ob- 
lerved, that if the glafs vefiel, into which the lulphur 
was. poured, was covered with a coating of metal, the 
electrical property of the two bodies would be increafed, 
the fulphur having acquired a ftronger negative, and the 
glafs a ftrong politive electricity (V. . 
(c) Sept. 23, 1776. 
(d) The item of the glafs fhould be varni-flied, or covered with cement, and 
the cone of fulphur (as M. epinas hath direfted) be provided with a glafs handle, 
that the refpefhve bodies may be feparated at pleafure, without touching them/ 
I have 
