Who are those faces on the old Manual High School?

At the corner of Brook and Oak Streets in Old Louisville sits a building that started out as the duPont Manual Training High School, back in 1892. When Dan Trabue moved to the neighborhood around 25 years ago, he noticed something curious near the building's roofline: six round medallions, each with a face staring out over the neighborhood. "I was curious who they were and I couldn't really see…