Gravity meter

[Atul Asthana]

Has any one succeeded in building and using a gravity meter? for locating cavities or masses of dense material (treasure) in the ground?

Some patents about simple gravity meters are :
http://www.freepatentsonline.com/result.html?p=5&srch=xprtsrch&query_txt=icl/g01v7+and+abst/(gravity+or+gravitation+or+gravitational)&uspat=on &usapp=on&eupat=on&jp=on&pct=on&date_range=all&ste mming=off&sort=chron

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