According to the next few sentences in the article: > The film was taken off the main roll at high speed, flowed upwards 20ft to overhead rollers, passed horiz

According to the next few sentences in the article: > The film was taken off the main roll at high speed, flowed upwards 20ft to overhead rollers, passed horizontally 20ft and then downwards to the slitting device, where it was spooled onto shorter rolls. The whole operation formed a cubical shaped tent, with two walls and a ceiling approximately 20ft square.