[ Ref. 151031 MMDigest, Wurlitzer Duplex Roll Mechanism Explained ]

I have recently had several e-mails enquiring about the DVD that
I produced on the Wurlitzer duplex roll frame, tracker bar and vacuum
transfer case.  The DVD uses 1.16 GB of space, and has approximately
175 Power Point slides, of which about 120 are actual photographs,
most of which are annotated with comments about the mechanism that can
be mouse-clicked on and off.

There are several short videos (some of which are repeated in slow
motion, either 25% or 10% of actual speed, none of which are more than
20 seconds long as I remember), two seven-set illustrations (my own
drawings) showing the position of the cams in the various stages of
rotation, one set with extensive narration which may be mouse clicked
on or off, and one with more realistic illustrations of the cams and
what I call "Vertical Lever A" (the almost vertical lever with the
small wheel at the bottom which sits on top of the cams) with almost
no narration except to show the direction of rotation and labeling the
various stages of rotation; i.e., rewind, neutral, or play.

My own Power Point drawing illustrating (with motion) the on and off
positions of the Wurlitzer Unit Valve including pressure differences
between the three compartments within the valve, the position of the
sealing discs, and the accompanying position of the vacuum pneumatic
which pushes the "push rods" to open the pallets in the common wind
chest releasing air into the individual wind chests.  The push rods
and position of the pallets also move.

My drawing of the side view through the a "cut away" channel board, as
well as my actual measurements of a unit valve (made with a millimeter
ruler, and also an electronic caliper).  My Power Point drawings, with
movement, of the "vacuum changing slider", the organ "start up slider"
(which prevents vacuum from going to the tracker bars and stops roll
frame motion during organ start up), and another set of seven Power
Point slides showing the various stages of operation of the "Vacuum
Transfer Case".

Matthew Caulfield kindly provided me with two photographs of an
actual dissected vacuum transfer case in which is included labels
that are either present or not present with the click of a mouse.
Additionally, Matthew provided me with a photograph of an actual
Wurlitzer blue print of the tracker bar roll frame mechanism with
the date of drawing on it that I have included in two slides (it has
Ralph Tussing's name handwritten on it at the top of the blue print).
I have given him photographic credit with non-clickable labels on
these photographs and a preceding slide of explanation thanking him
for the blue print with his name clearly displayed as the contributor.

I have had several e-mail inquires concerning availability of the
DVD.  My wish is to make the DVD available to everyone, but I am not
interested in marketing it.  Therefore I have approached AMICA and
COAA with a proposal in which I would retain full copyright privileges
to the DVD, but grant to both organizations (free of charge to the
organizations) the right to reproduce and sell the DVD for whatever
price they feel appropriate, and let the respective organizations keep
whatever profits they make for the good of the organization.

My only restrictions on them would be that my full name appear on the
title slide as well as a suitable notice of copyright.  I have just
made this proposal to them, and am awaiting a reply from both of these
organizations.  So at this point distribution to the public of the
DVD is in a "holding pattern".

I sincerely hope that they will take me up on my offer.  If they do
not, I will find another way to make the DVD available to the public at
a reasonable price yet to be determined, but hopefully this will not be
necessary.  The DVD will eventually be available to the public, but the
mechanism of distribution is currently being worked out, so please be
patient!

Mike Jones
mrckmmj@hotmail.com.geentroep [delet ".geentroep" to reply]