Iowa State University; Dept. of Chemical and Biological Engineering; Des Moines Coal and Mining Company
Nine men wearing safety helmets are sitting on two of three large barrels in front of the mine. On their left is a Western Railway car filled with coal. There is a coal cart at the mine entrance on the upper level.
Iowa State University; Dept. of Chemical and Biological Engineering; clay rings for sewage treatment filters
Chemical Engineering Professor W.E. Galligan, Ralph H. Suebbers, (graduate student) and Dr. Max Levine (Bacteriology) examine clay rings (produced in Ceramic Engineering Laboratory) for sewage-treatment filters as part of a general station study).
Iowa State University; Dept. of Chemical and Biological Engineering
Two researchers are standing before a bubble cap column. The column is surrounded by metal scaffolding and stairs lead to the upper levels. One individual is standing on the highest level near the top of the column.