Lichtenberg Figures are branching electric discharges (or electrical trees) that are sometimes preserved on the surface or the interior of a solid dielectric. They are named after the German physicist Georg Christoph Lichtenberg, who originally discovered and studied them. One way that they can be produced is as follows: A sharp-pointed needle is placed perpendicular to a non-conducting plate, such as of resin, ebonite, or glass, with its point very near to or in contact with the plate, and a high voltage Leyden jar (a type of capacitor) or a static electricity generator is discharged into the needle. The electrification of the plate is now tested by sifting over it a mixture of powdered flowers of sulfur and red lead (Pb3O4 or lead tetroxide).
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