This interesting porcelain piece was found in a group of insulators I recently purchased. Anyone have any idea of what it is or how it was used? I've never seen anything like this before. Hemingray-42 is for size comparison. Any help would be greatly appreciated!
UPDATE: With a little help from David Dahle and some research of my own, I found my answer: http://cjow.com/archive/article.php?month=12&a=12Porcelain%20Insulator%20News.htm&year=1990