- Peter Williams,
- Nicholas Thistlethwaite,
- Edwin M. Ripin
- and John Koster
A device for the gradation of volume in keyboard instruments.
The Swell organ is that manual department of an organ whose chest and/or pipes are enclosed on all sides by a box, one side of which incorporates a device (lid, flap, shutters, sashed panel, etc.) that can be opened and closed by connection with a foot-lever or pedal. A stop or half-stop may be thus enclosed, or several departments (Choir organ, Solo organ) or even the whole organ (Samuel Green, St George's Chapel, Windsor, ...