Two views of hot relaxing plates on a drawing machine used at the DuPont plant in Seaford, Delaware during the early stages of synthetic fiber production and research. The plate on the left was electric-heated and the…

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…

General view of a continuous polymerizer salt holding tank used during the early stages of synthetic fiber production and research at DuPont.

General view of the component parts of a two-gear melt-pool booster pump used during the early stages of synthetic fiber production and research at DuPont. Typically, such booster pumps were used to feed a bubble-free…

General view of a monomer still used during the early stages of nylon production and research at DuPont. The photograph is labeled "Figure 2," indicating that it appeared in a report or publication.

Assorted apparatus, including a Fenwal Thermoswitch and Thermoregulator, H-B Mercury-in-glass Thermostat, and Scaico Thermostat, used during the early stages of synthetic fiber production and research at DuPont.…

Two views of a measuring cell used during the early stages of synthetic fiber production and research at DuPont. Typically, such cells were placed in an electrolyte bath as part of a metered device used to measure the…

General view of a continuous denier meter used to measure the denier, or thickness, of filaments during the early stages of synthetic fiber production and research at DuPont. The spool of yarn to be measured is visible…

General view of a yarn windup used during the early stages of synthetic fiber production and research at DuPont. The components of the windup are identified as follows: windup rolls (left); gear box (center); and…

Two views of a six-position staple spinning unit used during the early stages of synthetic fiber production and research at DuPont. Various components of the spinning unit are visible in the photograph, including a pump…

Close-up view of the pump block of a six-position spinner used during the early stages of synthetic fiber production and research at DuPont. During the production of nylon, melt from the spinning machine typically…

Detail view of a trumpet and chamber for a 2.5-inch-wide roll crimper used to crimp textile fibers during the early stages of synthetic fiber production and research at DuPont. Typically, fibers entered a crimper…

Detail view of a high-speed creel guide used during the early stages of synthetic fiber production and research at DuPont. "Creel" refers to a rack holding bobbins or spools for spinning. The photograph is labeled…

Detail view of a wide-roll crimper chamber used to crimp textile fibers during the early stages of synthetic fiber production and research at DuPont. Typically, fibers entered a crimper machine via drive pulleys and…

Detail view of a type of crimper used to crimp textile fibers during the early stages of synthetic fiber production and research at DuPont. Typically, fibers entered the machine via drive pulleys and were fed into a…

Three close-up views of tension measurements taken on various components of a drawing machine, including the draw, creel, and crimper, used during the early stages of nylon production and research at DuPont. The…

General view of technicians inspecting the feed to the two-position spinning machine used at the DuPont plant in Seaford, Delaware during the early stages of nylon production and research. The two cylindrical hoppers…

General view of technicians inspecting an autoclave located in the Polymer Wing at a DuPont facility during the early stages of synthetic fiber production and research. The individuals visible in the photograph are…

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…

General view of technicians inspecting the creel (a rack holding bobbins or spools for spinning) on a staple drawing machine used during the early stages of synthetic fiber production and research at DuPont. During the…

General view of the distillation units located in the first floor Organic Laboratory at a DuPont facility during the early stages of synthetic fiber production and research. The individuals visible in the photograph are…

General view of component parts, including a holding tank, flash tube, spinner, and finisher, of a continuous polymerizer used during the early stages of synthetic fiber production and research at DuPont.

General view of assorted machinery, including a holding tank, evaporator, and auxiliary steam boiler, used for batch wise production and storage of low dew point melt during the early stages of synthetic fiber…

General view of component parts, including a holding tank, flash tube, condenser, and finisher, of a continuous polymerizer used during the early stages of synthetic fiber production and research at DuPont. The…

Two views of a two-position tire cord machine used during the early stages of synthetic fiber production and research at DuPont. The hot pin and hot plate tandem apparatus used to draw various fibers is visible in both…