I would like to find out some information on a player that I am looking
at buying.  It is an "Ennis", made by the Williams company from Canada,
and by the serial number it is made in about 1925.

The unusual thing to me is the tracking mechanism which actually moves
the tracker bar left or right driven by two large opposing pneumatics.
It has five pneumatics driving the motor (similar to the Standard
action) and, from what I can see, it has rather small vertical valves
on a two-tier stack.

The action didn't have a name that I could see, so if any one can help
me on this one and possibly some of its good points or problems out of
the norm, it would be greatly appreciated.

Cheers
Brenton Jenkins
Barossa Valley
South Australia