[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 I think it's out of date.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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