Open Wood

"However, they take up a huge amount of space, and since the Organ Reform Movement, independent pedal departments have often displaced these leviathans. Having said that, in large buildings, they make a grand underpinning of the principal chorus, and in their 32' incarnations they are the sine qui non of the English Cathedral Organ. Wind pressure at the feet of these monsters is often remarkably small - often under 2". Although sometimes described as an Open Diapason (wood), the vast scale makes the Open Wood much more like a large scale open flute in tone. The stop is almost exclusively found on the pedals."
by Alastair Disley

http://www.organstops.org/o/OpenWood.html 
Copyright © 1999 Edward L. Stauff,