Abstract :
W. V. Lyon (Massachusetts Institute of Technology, Cambridge): A method, such as Doctor Pipes proposes in his paper, which avoids solving a high-order determinantal equation, is welcome. I should like to point out two things. First, the condition of symmetry which Doctor Pipes imposes is more severe than necessary. Second, the resolution of the determinantal equation into factors can be accomplished by means of symmetrical components alone without recourse to matrix theory. For example, consider six equal circuits, each having the same operational impedance. Let each of these circuits be coupled to one of six equal coils equally spaced around a uniform magnetic ring, so that the mutual inductances between adjacent coils are equal, between alternate coils are equal, and between diametrical coils are equal.
