The front of the Knoll. The home's dormers, towers, chimneys, entryway, driveway, and garage are visible. An evergreen partially blocks the view of one tower; and a small, blossoming tree partially blocks that of the garage.
Iowa State University; Dept. of Chemical and Biological Engineering; Agricultural wastes
A large drum is partially visible on the left and a large can is sitting on a table in the center. There are a several pipes, valves, and a motor on the lower right. A Sweetland filter is on the floor at the bottom center of the photograph.