An electrophorous consists of a flat metal disc (A), an insulating handle (H), a flat disc (B) made of ebonite and a metal sole (H).
The device is used to obtain and save static charges for scientists completing experiments. An electrophorous can be charged through either induction or conduction and its charge can be sustained as long as you keep holding the handle..
In our lab, "H" was the foam cup, "A" was the salad pan and "B" was the foam pad.
How does it work?
An electrophorous's goal is to obtain more electrons. In our lab, we rubbed the foam pad with the rag and then put the pan on top of the pad. After being rubbed, the pad has lost many electrons. The pan serves as a conductor though which electrons from your finger can be passed. The shock which occurs when you touch the pan is the result of electrons being passed from your finger to the pan, which subsequently can pass the electrons on to the leyden jar by way of the paper clip.