Observations on a new Electrical Machine . 5 1 9 
grey’s experiments, and thofe made with Mr. adams’s 
little apparatus now under confideration. Having pro- 
cured a plate of glals, ten inches long and eight inches 
broad, coated in the manner of Mr. adams’s, I was in- 
clined to purfue thefe inquiries fomewhat farther.. Ac- 
cordingly, I placed, upon a ftrong fupporter of. glals, a 
circular board, with a fmooth and flat furface; and upon, 
this board I laid a circular brafs plate, of nearly the fame 
iize; and laftly, I placed upon the brafs plate Mr. can- 
ton’s elearometer. Then, having excited the plate of 
wax with dry, warm flannel, experiment 3, I let it upon 
the infulated apparatus. The balls prefently. opened, 
and, on examination, appeared to be elearified nega- 
tively; but, on removing the wax, they clofed, and. 
opened again much wider, and were then found to be 
elearified pofitively. In this experiment, the quantity 
of elearicity, naturally inherent in the balls, firings, See. 
had been drawn up into the apparatus by the attractive 
power of the excited plate of wax, and they were thus 
left in a negative flate; but, on removing the plate of 
wax, the balls clofed again, in confequence of the 
return of the elearicity, which would be increafed if 
the plate of brafs had been touched by a finger, Sec. 
and the balls then became very powerfully elearified 
plus. By applying, in the fame manner, the excited un- 
coated plate of glafs, or the excited uncoated fide of the 
fame plate, the reverfe of thefe phenomena took place, 
as I have before deferibed them and referred to in the 
beginning of this paper.. 
Experiment 4. I infulated two of Mr. canton’s elec- 
trometers, a and b, and having railed them in fuch a 
manner 
