Lichtenberg's Double Electrophorus
branch of study: electricity / electrostatics
inventor: Georg Christoph Lichtenberg, year unknown
The Double Electrophorus is a further development from the, capable to produce and provide both electrostatical charges by means of electrostatic influence. To achieve this state one half of the electrophorus is charged by friction. Then the metal plate is placed on top and grounded before the charge from the plate in turn is brought onto the other half of the electrophorus by a spark discharge.
A video on how to charge the electrophorus can be found on.
The respective electrostatic charges from the Double Electrophorus can be used to produce Lichtenberg Dust Figures. These are formed once an electric charge is brought from the electrophorus to a resin plate. The plate is then dusted with e.g. lycopodium powder. The positive and negative figures can be easily identified, the negative figures ususally showing more and thinner branches.
A video on how to produce the Lichtenberg Figures can be found on.