This drive setup sounds similar to the clutch/ drive setup in my John
Deere 10-32 Snowblower.
  The drive speed was set by a lever, which placed the small driven wheel 90
degrees against the larger driving wheel at different points within it's
diameter; closer to the outer drives it faster, closer to the center drives
it slower.  If you placed it dead center, drive would stop, if you went a
little beyond center drive would reverse.
  The large disk was all smooth steel and was attached to the engine's
output shaft.  The smaller disk was rubber-edged to allow clutch-type
slippage while changing speeds.
  Great simple infinitely-variable transmission. I've been thinking of using
this type of a design to make a transmission for a vehicle.

Mike B.

----- Original Message -----
From: "John Rodgers" <inua@CHARTER.NET>
To: <vanagon@GERRY.VANAGON.COM>
Sent: Wednesday, April 30, 2008 6:24 PM
Subject: Help Me, Volks!

>I am looking at a very old machine called a Radcliffe Jigger/Jolly. The
> thing has a motor that by way of belts drives a sheave (big pully) on
> the end of ahorizontal shaft about four feet long. On the opposite end
> from the sheave is mounted a big metal disk. This shaft with it's disk
> turns at a constant RPM. .
>
> Where the big disk is, it engages a small wheel mounted on a vertical
> shaft. I cannot see from pictures exactly how that smaller wheel moves,
> but somehow this is a clutch assembly and drive assembly that allows the
> large disk to drive the smaller wheel to drive the vertical shaft. At
> the same time, it allows the vertical shaft to speed up and slow down.
>
> So, my questions is, which way does the smaller wheel have to move to
> speed up and which to slow down??. Towards the center of the big disk -
> or away from the big disk.
>
> Has anyone ever seen such a thing? How would you clutch it to disengage
> it altogether.- put it in an idle mode?
>
> Thanks,
>
> John Rodgers
> 88 GL Driver
>