Instructables
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Picture of Simple Leyden Jar
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So I needed something to procrastinate from homework with one day, so I decided I would make this leyden jar. I had all of the materials laying around (as do most people) and about ten minutes I didn't want to spend doing homework, so this was perfect. the design is pretty straight forward, so I will not go into a whole lot of detail. Either way, this is a perfect beginning electronics project for anyone. I do not think there is really anybody who is not capable of making this. 
 
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Step 1: Construction

Picture of construction
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Leyden jars have been around since the late1700s. They are basically a primitive capacitor. it holds charge and will discharge.
In this jar there are five main parts. the inside foil, the outside foil, the inside wire, the outside wire, and the jar itself which must be an insulator. basically if you build up a positive potential in the inside foil, and keep the outside foil grounded, it will want to make the charge on the outside equal that of the inside, so a spark will jump from the grounded outside to the inside.
      To make it all you need to do is glue some aluminum foil to the outside of the jar (which needs to be glass or plastic), and tape a wire to it, glue some more foil into the inside and tape some wire to that. drill a hole in the lid of the jar and put the wire connected to the inside through it. screw on the lid and you are done.



great idea.i made one and its so easy.just charging is a little challenge.except that every thing is easy
Higgs Boson (author)  argha halder2 years ago
Thanks! I was actually kind of surprised by this, but simply walking on carpet while holding the outside foil can create enough static electricity to charge the jar. This only works in low humidity of course... You can also stroke the wire from the inside foil on a CRT TV or monitor to charge it, or use a van de graaff generator (like the one I madehttp://www.instructables.com/id/350kv-Van-de-Graaff-Generator/) or a wimhurst machine to charge it.
Jacky P2 years ago
Can you use a metal lid?
Higgs Boson (author)  Jacky P2 years ago
You could, but you would want some distance between the outside foil and the lid, which would depend on how big of sparks you would be expecting to make. I would make the distance double what you expect to make.
TheITSystem3 years ago
I heard that copper wire doesn't work for this.

Have you done it with copper wire?
Higgs Boson (author)  TheITSystem3 years ago
Yeah That is what I used for this project. It worked fine.