At the center of the photograph is a brick structure enclosed by a metal frame on wheels. The man on the left is operating a switch and there are pipes leading from the structure into two oil drums on the right.
These two rotating cylinder drums are operated by pulleys. On each drum is a spigot and each has a rectangular pan underneath. The drum on the left is smaller than the one on the right.
The researcher on the right is standing in front of the Link-Belt Roto Louvre Dryer used in sulphate fertilizer research in the West Chemical Engineering Building. The researcher on the left is standing in front of the control equipment taking notes.
