Sergey Dryga dryga.us> writes: > Without knowing the details of the crystal configuration, the effect seem= s > feasible enough. =20 Gravity vector *orientation* caused crystal frequency changes are well documented by makers. Technically one is weighing the crystal in various configurations and not measuring "gravity" at all. I think that mr eevblog should have mentioned the need to use at least a Rubidium clock as counter reference when doing what he did. He must have started some new movement among the masses with that blog (which I did not watch). All clocks and watches also undergo the 2g "tipover" test for certification, among other things. Also some of the effects CAN be seen on decent equipment. Here's a writeup by Brooke Clarke who used to be on this list too: http://www.pacificsites.com/~brooke/I/timefreq.shtml (search for 'gravity' in that) -- Peter --=20 http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .