[time-nuts] time-nuts Digest, Vol 53, Issue 46

Björn Gabrielsson bg at lysator.liu.se
Fri Dec 12 21:54:42 UTC 2008


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 I think it's out of date.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





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