PSN-L Message - Subject: RE: Lehman Designs

Hi Jerry, If you look at many of the designs you will see that typically the support wire from the boom to the vertical member is roughly 45 degrees. I'm not aware of any rules that govern the support angle. If the support angle is too low then the support wire tension gets too high. Gary Gary Lindgren 585 Lincoln Ave Palo Alto CA 94301 650-326-0655 www.blue-eagle-technologies.com Check out Lastest Seismometer Reading cymonsplace.blogspot.com sites.google.com/site/seismicsensorinfo/Home Design Details for New Vertical Seismometer From: psn-l-request@.............. [mailto:psn-l-request@............... On Behalf Of GPayton Sent: Thursday, June 10, 2010 7:38 PM To: PSN Network List Subject: Lehman Designs Hi All, I was wondering if while designing (building) a horizontal Lehman type sensor, there was a ratio between the dimensions of the length of the pendulum arm and height of the vertical member? Thanks, Jerry

Hi Jerry,

If you look at many of the designs you will see that = typically the support wire from the boom to the vertical member is roughly 45 degrees. = I'm not aware of any rules that govern the support angle. If the support = angle is too low then the support wire tension gets too high. =

Gary

Gary Lindgren

585 Lincoln Ave

Palo Alto CA 94301

650-326-0655

www.blue-eagle-technologies.com &nbs= p; Che= ck out Lastest Seismometer Reading

cymonsplace.blogspot.com =

sites.google.com/site/seismicsensorinfo/Home<= /a> Design Details for New Vertical Seismometer

From:= = psn-l-request@.............. [mailto:psn-l-request@............... On Behalf Of GPayton
Sent: Thursday, June 10, 2010 7:38 PM
To: PSN Network List
Subject: Lehman Designs

Hi All,

I was wondering if while designing (building) a = horizontal Lehman type sensor, there was a ratio between the dimensions of the length of the pendulum arm and height of = the vertical member?

Thanks,

Jerry

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