Mr. Montgomery sets out a Theorem which I myself published, with an almost identical proof. I there pointed out the great practical advantage of the Theorem in allowing current ratios to be measured, without introducing the current-meters which would upset circuit conditions, by observing a voltage-ratio under reversed transmission conditions; this was not noted by Mr. Montgomery. Inquirers will find that, by some accident, my con­tribution was not listed in the Index of the Wireless Engineer; my theorem has in consequence never been referred to in the standard texts. It follows that I can­ not blame Dr. Hurtig for introducing it in 1956 as a novelty. The derivation occurred, almost by accident, as far back as 1929-30, and follows herein