James R. Thomen (1926-) was manager of the Experimental Station from 1975 to 1985 when he retired. The DuPont Company's Experimental initially, was to be a small laboratory to screen inventions which were coming into the company from outside independent inventors specifically for research on black powder, smokeless powder, and dynamite, but soon its mission was altered and it became a large industrial research facility focused on innovative advancements in chemistry. This collection consists primarily of photographs of buildings at the Experimental Station in Wilmington, Delaware taken between 1910 and 1950.