Some documentation here from when Main street had a tinsmith, or maybe down the road a bit. Barn Cupolas are wonderful, big throwbacks to the family farm. I don't think those huge chicken factories hidden back behind chain-link fences so you don't go see how they are raised need cupolas. They need FANS for sure...but our major bird breeding manufacturing processes aren't too concerned with the blowing wind direction...or making the factory stand out. An indication of their shame, I think. What they are interested in is hormone fed birds and clipping their beaks so they don't fight.