I had one of those old galvanized brower 846 incubator given to me recently. It is in excellent shape, and I fired it up the other day. Although it seems to have an abundance of vent holes, this thing holds temp like a rock. I wonder if it's metal construction helps it to keep stable temps? It's amazing! I stuck a dozen of my silkie eggs in it last night just for the heck of it. Just wondering if anybody else uses them, and how well do they work. They must be ok, they have been in use for at least 70 years or so.