Some Applications of Field Plotting

By the process of field-plotting in the cross-section of a uniform transmission line, an orthogonal field pattern of curvilinear squares satisfying the boundary conditions is obtained. If Nv is a number of voltage steps and Nf the number of electrostatic flux lines in this field plot, the characteristic impedance is given by Z = 377Nv/Nf¿¿/k where ¿ is the permeability, and K is the permittivity. Applications to coupling and screening are also considered. The use of models in an electrolytic tank for capacitance determination from field plots or direct measurement is discussed, and an axially symmetrical three-dimensional field is plotted. Mention is made of the relaxation process and rubber-sheet methods of field-plotting.