On Sat, 21 Feb 2009 21:05:59 -0500, "Roger Long"
wrote:

"Wayne.B" wrote
I have since then taken more recent measurements and come up with a more
accurate
figure by averaging a number of rolls. It came out to about 3.2
seconds, quite close to my original estimate.

Is that a complete roll, all the way from one side, over to the other, and
then back again to the starting point?

Yes, one complete roll.