Detail views of screw and booster pumps used during the early stages of synthetic fiber production and research at DuPont. The photographs are captioned "Figure 4--Experimental Melt-Pool Screw Pump" and "Figure 5--Three-Gear Booster Pump," indicating that they appeared in a report or publication.
“Screw and Booster Pumps Used for Production of Synthetic Fibers,” 1946–1947. Joseph X. Labovsky Collection of Nylon Photographs and Ephemera, Box 3. Science History Institute. Philadelphia. https://digital.sciencehistory.org/works/gq67jr22v.