Animated GIFs of Valve Movement

["Donald R Smith" <drsmith@iinet.net.au>]

Can anyone tell me where I might find an animated GIF or similar showing or
depicting the valve movement of Walschart's Gear.
Many of my rail videos have shots of initial movement from stop to go but
not clear enough to study the movement.  Further, the shot can't be slowed
or stopped easily.  Vid clips of the loco at speed do nothing as the
movement is a blur.
A series of drawings could help but I would prefer something which gave a
fluid movement.

Don


--
Donald R Smith
drsmith@iinet.net.au
http://www.iinet.net.au/~drsmith/drsmith.html