Original poster: stork <stork@xxxxxxxxxxxxxxxxxxx>
Don't know what it is...
Cheers,
Terry
Terry,
There is a very simple explanation. We see this effect in medical imaging
all the time. An example is a simple x-ray where a three dimensional
object is reduced to two dimensions on the x-ray film. When an image is
taken end on or longitudinally of a cylindrical object, such as a blood
vessel or air in a bronchus, the density of the object is greatly enhanced
or reduced depending on density. And, since these images are nonlinear
this image is greatly accentuated. If x-rayed again at 90 degrees
orientation the object completely vanishes on the x-ray.
We all know these TC arcs spiral. The beading is nothing more than a two
dimensional depiction of a three dimensional process. The bead photographed
is simply looking longitudinally down a short segment of an arc. If two
cameras are synchronized and at 90 degrees orientation beads will
photograph on either, but not synchronously together.