Porcelain Station Insulators of some type?

By Andrew Gibson; posted June 10, 2012

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Does anyone know what these are, particularly the three on the left, and most particularly the one at the very left? How would they have been used?

The left-most one has no threads -- as you can see in the bottom picture, the interior is glazed. It's just a smooth, deep, conical indentation in the bottom.

The center two both have sand around the top and bottom holes, as if these are just parts of other things that were never assembled. The light blue one is marked with the Victor logo. The holes do not go through the entire piece -- the top and bottom holes don't meet.

The right-most one is a normal power piece, other than the clamp assembly on top. No idea if there were more pieces to it.

Thanks for any thoughts!