Illinois: a giant chimney in Chicago (exterior then interior shots). Views inside chimney, being built by Rust Engineering Company of Pittsburgh. Workers construct chimney’s ‘corset’. This is construction of metal fastenings securing the inside of the chimney horizontally. Workers put them together. Engineers look through a book of chimney ‘corset’ calculations at the Rich Huntington Iron Works. Metal is shaped in pre fabricated steel manufacturing works. Rows of steel lined up. Views of three tall chimneys stood side by side. “Air-purifying chimneys”. Views from ground, looking up at them and the sky above.