The night shift crew at a paper mill told the incoming day shift supervisor that the press was putting an unwanted black line on the paper being produced.

The machine tender attempted to remove the cause of the line by sanding the outgoing roll with emery paper, but it wasn't working.

The day shift supervisor reached into the incoming side of the press with his left arm to try sanding the paper roll. His arm was just one inch (2.54 centimeters) from the felt carrying the paper onto the rolls and only eight inches (20.3 cm) from the nip point […]