Thomas 47 Insulator 2 Tier Brown Ceramic 10” Disks W/ Lead? HEAVY 24# Vintage.

This is VERY heavy. The top brown ceramic disk has a few chips. I can’t get it to pivot.

The top lead? Piece has the name Thomas, some letters “BTC” and the numbers 3S23.

I think the ceramic disks say Thomas 47.

Do not know the age.