On Wed, 17 Jan 2007 17:54:33 -0000, "Les Hemmings"
wrote:

Under ac lighting the lines advance slowly in the direction of travel
meaning it's too fast I think... I may try it later with a flourescent tube.
It may give a little more definition than an incandescent bulb. the effect
could still be discerned though..

Les

Were you serious about Pink Floyd being two frets high? That would be
such a huge error that you wouldn't see movement in the strobe disk at
all - it would be a blur. If you are seeing movement slowly in the
direction of travel, it is going to be close enough that you would
need instruments, not your ears to detect the error. Is there any
chance you are fooling yourself here?

Do you have a musical instrument of any kind that is definitely in
tune. See if you can play along to something modern in a known key.
That'll give you your answer.

d

--
Pearce Consulting
http://www.pearce.uk.com