PSN-L Email List Message

Subject: Re: Video of a experimental pivot
From: "Geoffrey" gmvoeth@...........
Date: Thu, 23 Jul 2009 22:09:32 -0700

Howdy Meredith lamb,

Neato, Would it be possible to change the ratio
of the pivot point to 18 to 25 centimeters on the weight side
and one centimeter on the spring side and greatly reducing
the mass to get a longer period ?

I guess you need to reduce the mass by the
mechanical advantage of the ratio.

What kind of washers are those so shiny
you can see the JVC camera in it ??
Filing cabinets in the reflection.

Range limits are necessary so the device can be

Where would the damper go ?

It would be nice to have two such devices
in opposite directions to cancel out tilt
in a diff amp.
Two such matched devices are necessary
for proper operation.

Where would a magnetic damper go ?


----- Original Message ----- 
From: "meredith lamb" 
Sent: Thursday, July 23, 2009 11:35 AM
Subject: Video of a experimental pivot

Hi all,

I put up on the web a video of a "old" experimental vertical pivot based on
the Georgia Tech classroom
demonstrator of a vertical seismometer.  My index "channel" on youtube is

The title of the video is:  "Vertical seismometer experimental pivot".

Perhaps the video can add a certain amount of "spice" and/or
knowledge insight into the normally "dry"
subject of seismometers and/or design, operation etc.  The video is kind of
a "ad-hoc" experiment in
movie making on my was not previously planned out.

There is other different subjects of short clips therein also.

One will need a broadband internet connection to view such as it is some 38
megabytes and almost
9 minutes long.

Take care, Meredith Lamb


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