There is an impulse calibration procedure in Section 4.5.1 of the Manual on
Seismological Observatory Practice at this link.  Also see Bob McClures web
pages.

 http://www.seismo.com/msop/msop79/msop.html

Randy
----- Original Message ----- 
From: 
To: 
Sent: Saturday, July 26, 2008 02:00
Subject: Digest from 07/25/2008 00:01:49


>
> .------ ------ ------ ------ ------ ------ ------ ------ ------ ------.
> | Message 1                                                           |
> '------ ------ ------ ------ ------ ------ ------ ------ ------ ------'
> Subject: calibrating Lehmans
> From:    "Thomas Dick" 
> Date:    Fri, 25 Jul 2008 21:08:23 -0500
>
> Wasn't there an article on calibrating Lehman-type seismometers
> usingWinQuake and a small weight hitting the mass?
>
>
>
> .------ ------ ------ ------ ------ ------ ------ ------ ------ ------.
> | Message 2                                                           |
> '------ ------ ------ ------ ------ ------ ------ ------ ------ ------'
> Subject: Re: calibrating Lehmans
> From:    ChrisAtUpw@.......
> Date:    Sat, 26 Jul 2008 01:42:32 EDT
>
>
> --part1_ce0.338ab4aa.35bc1348_boundary
> Content-Type: text/plain; charset="US-ASCII"
> Content-Transfer-Encoding: 7bit
>
> In a message dated 2008/07/26, dickthomas01@............. writes:
>
> > Wasn't there an article on calibrating Lehman-type seismometers
> > usingWinQuake and a small weight hitting the mass?
>
> Hi Tom,
>
>        There was an article which used a paper clip and a 90 degree V of
> cotton thread to apply a known small force to the arm. You applied a match
to burn
> the thread and release it.
>
>        Regards,
>
>        Chris Chapman
>
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>
> In a
me=
> ssage dated 2008/07/26, dickthomas01@............. writes:

> 

> 
 : 5px; MARGIN-RIGHT: 0px; PADDING-LEFT: 5px">Wasn't there an article on
cali=
> brating Lehman-type seismometers 

> usingWinQuake and a small weight hitting the mass? 


> 

> Hi Tom,

> 

>        There was an article which used a
paper=
>  clip and a 90 degree V of cotton thread to apply a known small force to
the=
>  arm. You applied a match to burn the thread and release it.

> 

>        Regards,

> 

>        Chris Chapman   
>
> --part1_ce0.338ab4aa.35bc1348_boundary--
>
>
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