What are these?

By Paul Schackmann; posted July 19, 2017

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I would like to know what these poles carry and why. To the left of these poles is another pole (not captured in the photo) that carried one of these things for the middle phase. Any information would be appreciated. Thank you.

I have received many answers. They are regulator (or known as auto) transformers. Many thanks to all for answering my unquenchable curiosity.