I hope someone can recognize this antique I bought at a consignment house yesterday. I can not seem to find out anything on the web, but I suspect I am using the wrong words to search. It was tagged as a poultry brooder. It is one piece molded glass, approx. 7 inches wide and 9 inches to the top of the metal tip, the top is screw-on. The wording on the top says "Do not fill above this line" There is a symbol on the base with a diamond inside an oval, a larger number three and a smaller number zero. Any help is appreciated!