In reply to Brian Ahern's message of Fri, 29 Mar 2019 20:01:15 +0000: Hi Brian, [snip] >add monopoles to 1.
I was thinking about the fact that the frequency was quite fixed, and wondering if it is a consequence of resonance due to the dimensions of the block. If so, a calculation of the velocity might yield a clue as to the origin. Regards, Robin van Spaandonk local asymmetry = temporary success
