Omnibus asked me (in reference to the sketch I posted about faking a Finsrud device):
That possibility will be excluded if the non-magnetic ball stops sooner than the original, won't it?
No...if a non-magnetic ball stops that will not mean that there is no rotating magnetic array under the central dome. Determinining if the central dome of Finsrud's device contains hidden moving magnets is easy to determine. Simply place a small compass near the dome as the regular metal ball rolls continuously around the track. If that ball is being swept along by a rotating magnetic field, then the compass should react violently every time the central dome's magnetic field sweeps past it.
However, what if the
non-magnetic ball
also continues to roll continuously around the track?! This is a possibility for certain types of fake devices.
It's possible that the motion of the ball could be maintained by the almost imperceptible precession of the circular track on which it rolls. If that track is suspended in the air by arms from the central dome, then there could be a hidden cam operated mechanism in there that very gently tilts the track so as to apply gravitational force to the ball to keep it in motion.
If you are allowed to examine the device up close, then you might want to consider the possibility of the track itself being moved. I would also recommend that you inspect directly below the device on the floor below it for any evidence of hidden wiring. The possibility of such an
external power supply would, of course, be eliminated
IF you could get the inventor's permission to move the device to
another location in the gallery.
ken
On 7/6/06, I found, in any overbalanced gravity wheel with rotation rate, ω, axle to CG distance d, and CG dip angle φ, the average vertical velocity of its drive weights is downward and given by:
Vaver = -2(√2)πdωcosφ