Conversion. Copper and brass processing. Drawing seamless copper tube. Rough cast tubes tapered at one end to fit through a die are gripped in the tongs of the electric motor-driven vehicle on the drawbench and pulled or "drawn" through the die to reduce them to the desired size. Tubes usually are redrawn many times; each successive "draw" reduces the diameter, and increases the length. Brass tubes need to be annealed or softened between each draw, but copper tubes can be drawn several times without intermediate annealing. The tapered nose of the tubes may be seen just behind the drawbench operator. The tube is checked with a micrometer after being drawn, to make sure it is the right diameter. The man looking through the short section of tube is inspecting the inner surface for flaws. The Chase Copper and Brass Company, Euclid, Ohio
Palmer, Alfred T., photographer
United States. Office for Emergency Management.
Library of Congress