PS: regarding the loss of mass due to the wax melting, I think that an important factor is also that when side A tips down, this allows the wax to drip off the recess that the flame has hollowed out, whereas side B is held up and so wax collects in its recess. Thus B is heavier than A and so we get a rotation. And then the situation is reversed.
A bit like if you had two buckets on the edges being filled with water from a non-spillable source - they empty each time they get tipped down.
(, Sat 12 Jan 2013, 14:09, Share, Reply)