Historically, the conflicting opinions derived from Paul Dirac's "Hole Theory ca. 1930s" and " the Electron Theory" ca. 1890s" had much to do with the choice of positive or negative ground in early automobiles and tractors. That is . . . if we can believe what is written in historical accounts. I'm well read on the subject, but can't say I was there at the time, or knew any of the people actually involved. The general mindset, from what I've read specifically on the subject, the Hole theory showed more benefits towards postive ground and better metal corroisoin protection, and the Electron towards the negative ground. Many schools that taught electric theory favored one or the other. Yes some schools were biased then, just as many are today. I don't see it as being much different that the modern arguments between Ford and Chevy, BetaMax versus VHS, Blue Ray versus HD DVD, etc.
Paul Diracs Hole theory dealt with the absence of electrons. It was modified in the 1930s via the "Quantum Field Theory." Enrico Fermi also added to it, specifically in regard to the electron effect on metals.
So, I'm wondering what it is you are saying? None of this exists in historical accounts? You don't agree there was ever such disagreement? I can provide hundreds of source citations and some from primary documents.
This information certainly is discussed in the historical record when it comes to electric theory and engineering. And, I haven't found anything else near as strong as it relates to the choice of ground systems during those early times. Have you?
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