A method for obtaining a uniform electric field
"Electric field meters are used for the measurement of the electric field at the surface of the earth, on airplanes and on satellites. For research work and calibration of the meters, a uniform electric field facility is necessary. The accessibility of the usual parallel plane configuration is very poor, so it was decided to investigate the possibilities of two and four-ring systems to produce very uniform electric fields. An analysis of these systems was made and the results are presented as tables and curves of the geometrical dimensions, the charge ratio, and size of the volume of uniformity."