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The base is made of welded Dexion and the two braces are made of tubular electrical conduit MIG welded to the base
Damping is a thick copper plate "eddy current" damper on the left.
Period is about 14 seconds.
Unit is shown here outside of it's protective styrofoam box made of RMAX foil-clad sytrofoam.
Shown below my recording of the Easter Island Mag 7 event that occured mid-September 96.
