PSN-L Email List Message

Subject: Level of garden gate style horizontal seismometers
From: "Geoffrey" gmvoeth@...........
Date: Sat, 30 May 2009 14:31:29 -0700

Hello PSN;

Just out of curiosity has any of you guys with
those garden gate seismometers ever put one
of these little plastic levels on the lever
to see just how far off level it is at
10 or 20 seconds. I mean here like 1/2,
1/4 or so a bubble across the line
if you understand what I mean here ?

Maybe it is not even crossing the line
but you can see possibly its off level
and just touching the reference line ?

They got these fish eye levels that just tell you
the horizontal and I thought that that might help set
up your period ??

Has anyone ever seen a cheap calibrated level
that will tell you fractions of a degree
off level ?

Metrology, I have always thought, would be
a good profession to be in. :-)

Any comments ?



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