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Gravity Control Mark

G

GoVidGo

New member
I happened upon a wall while detecting and noticed this disc implanted/cemented in the top of the wall. Anyone have no idea what the heck it is?

it reads:

For Information Or To Report Damage Write Washington DC
Gravity Control Mark
National Geodetic Society
The Director
Pittsburgh CA 1989

Strange stuff you find sometimes, huh?

I was hoping to get the V3i levitating in the picture, but it never happened. Oh well.
 
Tha is a geodetic survey marker. Located with precision on a permanent fixture it can be used to start a survey from a known reference. There are tens of thousands of these throughout the US..
 
We have these in Tasmania as well. Often set into the concrete foundation adjecent to a Post Office

Pete
 
Oops wrong link......... this is the one....

http://geodesy.noaa.gov/GRAV-D/

Another one

http://www.waymarking.com/waymarks/WMADC6_ORONO_Boardman_Hall_Gravity_Control_Mark_1986_1997
 
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