For making tin-foil the metal is rolled into thin sheets, pieces of which are beaten out with a wooden mallet.
Each disk carried two strips of tin-foil extending nearly over a semi-circle, and there were two field plates, one behind each disk; one of the plates was P > P positively and the other negatively electrified.
This armature plate revolved in front of a field plate carrying two pieces of tin-foil backed up by larger pieces of varnished paper.
These glass disks carry on them a certain number (not less than 16 or 20) tin-foil carriers which may or may not have brass buttons upon them.
Dr John Bevis of London suggested, in 1746, the use of sheet lead coatings within and without the jar, and subsequently the use of tin foil or silver leaf made closely adherent to the glass.