What is this copper thing?

Hey, thanks, FL, for the detailed description. I've heard of heat pipes before and was aware of the Alaskan pipeline system but never put a lot of thought into how they worked. This is an interesting and clever application in a computer...trust Apple to make a Faraday cage do double duty as a cooling "tower". Bright idea but like it kinda fell down in how it was implemented, with all the heat failures.

I think the other place you maybe have seen something using a similar principle is with those "bobbing bird" toys where you set a glass of water in front of the bird and wet its head....it swings back and forth and slowly overbalances and dips its beak into the water, then starts the cycle all over again.

Jon.