General view of a rod spinner arranged for the production of bristles during the early stages of nylon production and research at the DuPont Experimental Station in Wilmington, Delaware. During production, a cylindrical nylon rod was pressed against a hot spinneret (a small metal plate with fine holes), through which the material was extruded to form bristles. Component parts of the spinner are numbered 1 through 5, presumably to assist with identification, though a corresponding key does not accompany the photograph.