Interviewer Well, at last the simulated bridge is finished, and I can make it wobble.

Interviewer Right. So if we get on it, we should be able to wobble it, yes?

Narrator We're just sailing out of harbor now, and it's at this stage when one can have a bit of a wobble mentally.

I'd like to convince you that the universe has a soundtrack and that soundtrack is played on space itself, because space can wobble like a drum.

It was not until 1891 that the American astronomer, Seth Carlo Chandler, made measurements showing that there was a periodic motion of 14 months in the Earth s wobble and suggesting that this was the polhode motion.

Allan McRobie is a bridge engineer from Cambridge who wrote to me, suggesting that a bridge simulator ought to wobble in the same way as the real bridge provided we hung it on pendulums of exactly the right length.