Mi1> Mr. henly’s Experiments and 
.neatly covered with the beft varnifh/^ ; and I fhould not 
omit to obferve, that Mr. hemming’s bottle, which re- 
tained its charge fo long, was prepared in this manner. 
POSTSCRIPT, 
.• Containing fome experiments and obfervations on Mr. 
volta’s machine y by Mr. tiberius cavallo, -with 
remarks by Mr. henly. 
Mr. volta’s machine, which occafioned feveral of 
the preceding enquiries, hath lately been made by Mr. 
cavallo, by coating the glafs plate (about fix inches in 
diameter) with fealing-wax. With one excitation of this 
platehe foon charged a bottle compleatly, and with that 
charge pierced three holes in a card, which he hath fince 
fhewed me. If, when this machine aCted vigoroufly, he 
inverted the excited plate, and fet the brafs plate upon 
the glafs, he produced a contrary electricity, but in a 
much fmaller degree. If when -the fealing-wax was 
ftrongly excited, fo that fparks, two inches long, might 
be * drawn from the brafs plate, -the excited wax, &c. 
' was placed on an eleCtric Hand, and the procefs continued 
- as ufual; the fparks from the ibrafs plate prefently dimi- 
The-varnilhing fhould be feveral times repeated. 
nifliedj 
