National Geographic : 1943 Jan
The National Geographic Magazine The Faster He Walks Backward the Thinner the Tubing A gob of red-hot glass is attached to a pipe called a punty and held on a cradle. As the blower steps back ward at a snail's pace, another worker (not in picture) fans the tube and calipers it for size. Before machine drawing all glass tubing was hand-drawn; now only special orders are made this way. Light plays ever-changing rainbow tricks on the rack of cooled tubes.