Huge lot of about 90 old and antique vintage unglazed porcelain tube insulators. Many of these are marked Brunt and the rest seem to be unmarked.
These tube insulators were used to allow early bare copper electrical wiring to be passed through rafters and wall studs. They range from about 3" to 4 1/4" in length and about 1/2" in diameter.
Some of these have broken or chipped ends.