“...the missing concept of "open-paths" (the dual of "closed-paths") was discovered, in which currents could be made to flow in branches that lie between any set of two nodes. (Previously — following Maxwell — engineers tied all of their open-paths to a single datum point, the 'ground'). That discovery of open-paths established a second rectangular transformation matrix... which created 'lamellar' currents...”
“A network with the simultaneous presence of both closed and open paths was the answer to the author's years-long search.”
“When only positive and negative real numbers exist, it is customary to replace a positive resistance by an inductance and a negative resistance by a capacitor (since none or only a few negative resistances exist on practical network analyzers).”Apparently Kron was required to insert the words “none or” in that statement. See also Gabriel Kron, “Electric circuit models of the Schrödinger equation,” Phys. Rev. 67(1-2), Jan. 1 and 15, 1945, p. 39. We quote:
“Although negative resistances are available for use with a network analyzer,…”.Here the introductory clause states in rather certain terms that negative resistors were available for use on the network analyzer, and Kron slipped this one through the censors. It may be of interest that Kron was a mentor of Sweet, who was his protégé. Sweet worked for the same company, but not on the Network Analyzer project. However, he almost certainly knew the secret of Kron's “open path” discovery and his negative resistor.
Simply go check his papers in the literature. Even today, there are few electrodynamicists really able to fully comprehend his advanced work. And his direct quotations from his own published technical papers in the literature leave no doubt he had made a negative resistor. Further, other scientists have commented on Kron's discovery of the “open path” connecting any two points in a circuit, and usable to provide energy transfer at will.
The mechanism by which he did this is what Kron was never allowed to reveal.