A proof that the induction motor circle diagram: Applies to the transmission line

The paper shows that the well-known circle diagram, first developed for the induction motor, is in reality applicable to the general network, however complicated, and therefore to the transmission line. The double-frequency power diagram is criticised as needlessly complicated, and the well-known constructions applied to all quantities of interest in the transmission line. Since it occupies only a few lines, elementary proofs are given of those parts of general circuit theory needed.