Constants of cables and magnetic conductors

In the paper on “Line Constants, Etc.,” equations were given for the inductance and capacity of the parallel conductors used in transmission lines. The formulas given were sufficiently accurate for any transmission line calculations where the distance between wires is large compared with their diameters; where, however, the diameters are comparable with the distance, as is often the case with cable transmissions, it is necessary to use the strictly theoretical expression.