Before the capacitor there was something called layden jar.It could store electrical charge and later discharge it.In this instructable i'll show you how to make leyden jar very easily.
Firs we'll need a couple of materials and tools presented in the picture:
Firstly we need to take the little plastic jar (you can use one from old films or a pill bottle) and tape the aluminum foil on the sides (you can use normal tape) .Then take the first wire and tape it on the aluminum foil on the bottle.
Then make a small hole on the top of the bottles tap with a sharp object (it will later be used for the wire).Then put the other piece of foil on the inside of the bottle like in the second picture.Tape it so it won't come off like in the third picture.Then take the other wire and tape it on the inside of the bottle.
You're finished.Just put the wire from the inside in the bottle's tap like in the first picture and you have a leyden jar.