Quote:
Originally Posted by saxo3
Interesting answer, never stop learning here 
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It's often a matter of gyroscopic forces acting on the balance with directional changes on it's axis.
Though in the past, I can attest that my 5 digit watches typically sped up considerably when they were subjected to rapid changes of attitude.
Neither of my DSSD's experience the same phenomenon.
I put this down to their weight dampening the motion sufficiently to mitigate the speeding up of the movement.