Hi all,

Theres a "interesting" mechanical rotational vertical
arrangement at:

http://quake.eas.gatech.edu/calib/Image27.gif

The rest of the web article is at:

http://quake.eas.gatech.edu/calib/Web%20version%20calib%20chapter.htm

Mechanically it does show a way to test "unknown" mechanical
spring/s for use as a short period vertical seismo, in
conjunction with a sliding adjustable mass.  

The two pivot point/s could be major frictional problem (?) though. 
I wonder if say....strong music wire acting as the rotational
pivots might enhance its use? 

Theres probably been references to such before....I don't know,
but it seems most interesting overall.  I don't recall seeing
any individual amateur vertical built along this particular route.

Take care, Meredith


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