Mr. Keith Pritchett, of Mansfield, England, has provided additional
technical information and illustrations of the Boyd Pistonola player
piano mechanism, reproduced from the 1921 book "The Pneumatic Player",
London: Musical Opinion Office, Chichester Chambers, Chancery Lane,
W.C.2.  See the article and drawings at
http://mmd.foxtail.com/Pictures/Pistonola/index.html

Robbie Rhodes