After Volta, new methods were invented for getting a stronger current of electricity by putting the metals into various liquids, water, and acids. By the use of these liquids electricity acquired so much more energy that it was no longer necessary to rub, as had been done before; all that was required was to place in a single dish pieces of different metals and pour on them the liquid, and electricity would be created and sparks would be elicited.
As soon as this kind of electricity was discovered, methods were invented for putting it to use; they could cover objects with gold and silver by means of electricity, and by means of electricity they could transmit signals from one distant place to another.
To do this, pieces of different metals are placed in glass jars, and liquids are poured over them. The electricity is produced in these jars, and this electricity is conveyed by means of a wire to any desired place, and from that place is led into the earth. The electricity in the earth runs back again to the jars and is conducted into them by means of another wire. Thus this electricity keeps going in a circuit, as in a ring—by the wire to the earth and back by the earth and again by the wire and again by the earth. Electricity can go in either direction, according as you may wish: it may go first by the wire and return by the earth, or go first by the earth and return by the wire. Over the wire, in the place where the signals are given, is placed a magnetic needle, and this needle points in one direction if the electric current comes by the wire and returns by the earth, and in the other if the electric current comes by the earth and returns by the wire. By this needle signals are given, and by means of these signals telegraphic messages are sent from one place to another.
