I've finally got around to putting a picture of the pneumatic stack
for the "reverse" Angelus player mechanism. It's on my web site at;-

  http://website.lineone.net/~agr/index2.html

Click on "Wilcox & White & The Angelus", then click on "Angelus Player
Mechanism" and there's a photo and a brief bit of text on how it works.
The photo is of the stack chest with the back removed so you can see
the action inside which works pressure- wise back-to-front when
compared with a normal pneumatic motor type player stack.

Best regards

Adam Ramet
agr@lineone.net