SIMPLE ELECTROSCOPE.
Drive the eye of a needle into a cork and stop a bottle with it, the point being up. At the balancing-spot of an eagle’s feather glue a little hard socket or cup of glass or metal, and place it on the needle point.
Sealing wax, a vulcanite comb passed rapidly through the hair, or other “excited” electrifier, will cause the feather to whirl round and follow it as iron will the magnet.