Analog Mapping of Poissonian Fields

A process is described for analog mapping of Poissonian fields which is well suited to the teaching laboratory. A capacitively coupled mapping system is employed in the form of a sandwich consisting of conducting silver paint, a thin tape as dielectric, and conducting paper. The technique allows the field from a single-source or from multiple-sources to be plotted. Field density information may be obtained directly from the map in the form of differential voltage measurements if desired. Some examples are included.