Fig. 8: Explanation of Volta’s battery
“On this system [see Fig. 7], lay a second cloth, then a third piece of copper and zinc in the same manner, fig. 8; the zinc side of this new piece will preserve its excess of vitreous electricity + 1; but, besides this, it will share, like every conducting body, the free electricity of the inferior pieces, which will be supplied at the expense of the ground; and when the electrical state will have become permanent we shall have: