On Thu, 2008-12-11 at 14:38 -0800, Brooke Clarke wrote: > Hi Mark: > > I think it's out of date. > > The current method is to drop an optical corner cube (retro-reflector) in a > vacuum and using a laser measure the distance it moves (which requires a > reasonably good source of time. > http://www.ngs.noaa.gov/GRD/GRAVITY/ABSG.html > > Have Fun, > > Brooke Clarke > http://www.prc68.com > > Mark Sims wrote: > > The quintessential gravity meter (Worden Gravity Meter by Texas > > Instruments)... still being made after 60 years or so: > > http://www.mssu.edu/seg-vm/pict0246.html
Spring based (relative) gravimeters are NOT yet dead... http://large.stanford.edu/courses/ph210/lee1/ and in local lingo for those so inclined... http://www.lantmateriet.se/templates/LMV_Page.aspx?id=4912 These are not _as_ good, but very mobile http://inertialsensor.com/qa3000.shtml -- Björn _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
