OK. Thanks to the help here, I had a few more terms to Google. The transformer is called an "instrument" or "current" transformer. It's job is to step down the voltage by a predetermined amount that will always be proportional to the current transferred to the load. If the load goes up then the current in the secondaries increases, which then goes to the rectifier, turned into DC, then off to the exciters to increase voltage. Within limits it makes the voltage self-regulating.
I have not been able to find a picture of a transformer that has the input going to the center of the windings then out to the edges. I think that is to send smoother waves to the rectifier. Still researching.
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