> This watch is not quartz, it is fully mechanical with a balance wheel.
What is the temperature profile of a mechanical balance wheel? That seems like something at least one time-nut would have good data on. Graphs of offset vs temperature for crystals are readily available. For the typical watch crystal, it's a parabola pointing down with the top at roughly body temperature. For a typical (low cost) PC crystal, it's a squiggle: up, down, up. The slope of the down part depends on the angle of the crystal cut. The specs say (roughly) within X PPM for voltage within V and temperature with T. The V and T form a box. Some engineer gets to figure out the tradeoff between angle, accuracy, testing, mumble, .... whatever works to get it within the box. ---------- > I wonder how well the human oven works in maintaining the environment of a > watch xtal or balance wheel, assuming the watch is worn 24x7. I don't have any good sociological data, but I've seen reports that watches work much better if worn 24x7 rather than placed on a night stand while sleeping. -- These are my opinions, not necessarily my employer's. I hate spam. _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.