Die elektrische Feldstärke zwischen zwei gewölbten Elektroden
An approximative method is given to find the strength of the electric field in a given point between two electrodes with curved surfaces. Two cylindrical surfaces standing in a rectangular angle to each other are placed at the electric field line touching the given point. Their intersections with the surfaces of the electrodes are near this line equi-potential lines and it is possible to place a square net (following Lehmann) between the corresponding intersections of both electrodes. This results to a field tube of rectangular cross section enveloping this point.