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On 10/5/2011 3:16 PM, Gary LaPook wrote:

Hmmm. if you kept your bottle of mercury under your parka and then poured it into the tray, it would level itself and then freeze in that position (like my wax horizon) and you wouldn't need to place a mirror on top of it (like with the wax version) to take star sights and you wouldn't have to worry about breezes rippling the surface after it is frozen. Still looks good to me. gl

We did a dog sled trip near Eli Minnesota a few years ago and enjoyed a lecture by some young women who had done a dog sled trek up through the lakes North of Winnipeg then East to Hudson Bay then South to Churchill.  They said the first month the high temp was -30F.  Anyway  one of their big problems was keeping their GPS units warm enough for the screen to function.   They had to keep the GPS inside there clothes bringing it out occasionally for a reading.  Another problem was getting gasoline out of cans into stoves for cooking and melting drinking water (for some reason, they wanted liquid water rather than snow for the dogs),  any spill on bare skin meant instant frost bite. They were resupplied by air a couple of times and stayed in some native villages along the way.