According to a picture on the website, the actual name of this
instrument is the Choralcelo.  Only in the past year was an extensive
treatise on it in the AMICA Bulletin by the noted organ restorer and
historian Keith Bigger.

At the Ruthmere website ( http://www.ruthmere.org/ ) some of the links
actually work.  The picture mentioned above was listed under "The
Collection":
 http://www.ruthmere.org/index.php?option=com_content&view=category&layout=blog&id=5&Itemid=12 

D.F. Rowe
Bronx, NY