Another Trick

Taking the theory of Steve McK: "Say we have a 1.5D bend at exactly 90 degrees cold. As it warms, the angle will decrease because there is more metal on the outside of the bend than the inside."

Now take four 90s welded together and forming a circle (torus, I think.). It is an exact circle when cold, but when it warms up, does it just roll away? If so, which direction? Just kidding,

Actually, an object of uniform material expands/contracts uniformly regardless of its shape, as long as it has been heated throughout. It is not required to be solid or of equal thickness.

Ben Received on Fri Apr 19 18:30:00 2002