Hi Pete, what is the image filename please
thanks
Dale


----- Original Message ----- 
From: "Pete Rowe" 
To: 
Sent: Thursday, June 14, 2007 1:11 PM
Subject: Re: Opinion on seismometer


> OK, thanks larry. I sent it to seismicnet. If all is
> well, everyone should be able to see it at:
> http://www.seismicnet.com/cgi-dos/event.exe
>
> Pete
> --- Larry Cochrane  wrote:
>
>> Hi All,
>>
>> This is a reminder that you can not send attachments
>> to the PSN-L list. If you have a
>> file you would like to share with the group you will
>> need to place it on a web/ftp
>> server somewhere and send the link to the file to
>> the list. If you do not have access
>> to a web server I can place the file on my system.
>>
>> If you have a PSN event file you would like to share
>> with the group you can send them
>> to event@.............. as attachments. The event
>> file(s) will show up on this page
>> http://www.seismicnet.com/cgi-dos/event.exe a few
>> minutes after my mail server
>> receives the message.
>>
>> Regards,
>> Larry Cochrane
>> Redwood City, PSN
>>
>> Pete Rowe wrote:
>> > Hi all
>> > I sent the following message with a pdf of my
>> > recording but it bounced back as too large for the
>> > group. I'm not sure how to send it any other way.
>> > Pete
>> >
>> >
>> > Here is my recording of the Guatemalan quake
>> today. As
>> > Jan mentioned, my seismometer is the size of a
>> > shoebox, has a three second period, is critically
>> > damped with a resistor across the coil, has almost
>> no
>> > weight on the boom, and I can see a 7.0 anywhere
>> on
>> > earth. The suspension is two fine steel wires
>> (violin
>> > E string) both of which are in tension. This sits
>> on
>> > the dirt under my house. The noise level is higher
>> > than normal today due to wind in the trees.
>> Normally,
>> > I have a very quiet baseline. It has been running
>> > almost untouched since 1988.
>> >
>> > regards,
>> > Pete Rowe
>> > San Jose, CA
>> > --- Jan Froom  wrote:
>> >
>> >> I can remember when Pete Rowe and I first started
>> >> playing around with
>> >> amateur seismometers... I built a large unit with
>> a
>> >> long boom with a
>> >> very heavy mass. Pete built a little unit, with
>> no
>> >> mass on his boom at
>> >> all. I had my unit mounted on three massive
>> concrete
>> >> piers... Pete set
>> >> his unit on a scrap of 2X4 under his house...
>> >> Funny thing... we both got about the same
>> results...
>> >> and Pete didn't
>> >> have half the problems I had.
>> >> Pete finally put a small fish weight on the end
>> of
>> >> his boom... I sure...
>> >> simply to appease me.
>> >>
>> >> I've also come to the conclusion that the antique
>> >> seismometers I've
>> >> collected all have large masses and huge coils
>> >> simply because they had
>> >> to generate enough power to drive a pen motors
>> >> directly, with no
>> >> external amplification. With today's amplifiers
>> and
>> >> technology you can
>> >> do a whole lot more with a whole lot less.
>> >>
>> >> Since the only response to my query about drum
>> >> recorders came from
>> >> Chris... I took his advice and took an aspirin
>> and
>> >> thought about my
>> >> problem. I've decided to take advantage of the
>> >> antique nature of what I
>> >> have, and capitalize on that. Part of what I've
>> >> tried to inspire in the
>> >> kids I've worked with... is the simplicity of a
>> >> seismic monitoring
>> >> system... the simplicity of a whole lot of
>> "complex"
>> >> scientific
>> >> devices... what better way then to let them see
>> the
>> >> simple pieces up
>> >> close... and if it looks a bit  "Rube
>> >> Goldbergish"... well that will be
>> >> kool too.
>> >>
>> >> Jan in Gilroy.
>> >>
>> >
>> >
>> >
>> >
>> >
>> >
>>
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