PSN-L Email List Message
Subject: Re: Incresing the period of a lehmans seismomter ?
From: =?ISO-8859-1?Q?J=F3n_Fr=EDmann?= jonfr@.........
Date: Sat, 09 May 2009 23:28:18 +0000
Thanks for the help of the weeks. I could not have fixed the issues with
out you all.
I am still having minor issues adjusting the period of my lehman sensor.
I am not sure if I have to move the boom up or down to increase the
period of my sensor.
On f=F6s, 2009-05-08 at 05:41 +0000, JAMES RIDOUT wrote:
> I found it very confusing when setting the period for my
> seismograph, and for a=20
> long time took the period to be the time it takes the arm to swing
> from one side to the
> other.( I could never get much more than 10 seconds)!!.
> But apparently I am wrong, The period is the time it takes for the
> arm to swing
> past the same point in the same direction twice. So if you hold the
> arm towards you
> and let it go, as it passes the centre, start a stopwatch, then
> let the arm go to the other side,
> then back towards you , and as it passes the centre again press stop.
> This is the period.
> Anyone please correct me if I am wrong. !!.
> --- On Fri, 8/5/09, J=F3n Fr=EDmann wrote:
> From: J=F3n Fr=EDmann
> Subject: Re: Incresing the period of a lehmans seismomter ?
> To: psn-l@..............
> Date: Friday, 8 May, 2009, 2:08 AM
> Hi all
> I got the period down to 6 seconds at the lower end, but at 4 sec=
> the high end. But I have to do it adjust the period really slowly=
.. I am
> not sure what I can detect at 6 seconds.
> Geoffrey, I know what you mean. I am trying to understand somethi=
ng in a
> diffrent language and am trying to understand something that I ha=
> got a big traning on.
> J=F3n Fr=EDmann.
> On fim, 2009-05-07 at 17:04 -0700, Geoffrey wrote:
> > Gee, I believe this to be one of those
> > garden gate seismometers.
> > I always thought of it as a modified
> > pendulum changing the acceleration of gravity
> > in a trigonometric fashion.
> > This means the mass is the lowest point on the lever arm
> > or you can not have stability.
> > It manipulates the pull of gravity
> > like Sine or Cosine of the angle relative
> > to horizontal.
> > I believe you guys are thinking much more
> > complex then myself.
> > You more than likely will never
> > take souls like me very serious.
> > Sort of like Rodney Dangerfield ???
> > ----- Original Message -----=20
> > From: "J=F3n Fr=EDmann"
> > To: "PSN-Postlist"
> > Sent: Wednesday, May 06, 2009 7:54 PM
> > Subject: Incresing the period of a lehmans seismomter ?
> > Hi all
> > Tomorrow I am going to make the final changes to my lehman seis=
> > hope that this changes make the seismomter get down to 20 secon=
> > at most.
> > The only thing that I need to know is this. What is the best wa=
> > increase the period of my lehman seismomter ? Moving the boom d=
> > up ? Or do I have to do something else.
> > Regards.
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