I have built a new lehman seismometer and I have a few questions its been s=
everal years since my last one and I have forgotten a lot.

A. I have a small outdoor building not temperature controlled thats why I b=
uilt the wooden box with insulation.
I am getting noise starting about 1:00am to about 9:00am=20
should I build an outer box made of foam board and heat it with a heating p=
ad or something to control the temperature.
link to the box and noise
http://www.1goss.com/s-box.jpg =20
noise example=2C I had it most of the afternoon although normally during th=
e day it looks like it should.
http://www.1goss.com/noise.jpg

B. The first sensor I built several years back I donated to the local eleme=
ntary school when were moving.
It used the razor blade knife edge and steel all thread for the boom and di=
d not have the small aluminum rod I put in the new one.
It worked well but I wanted to build a better one this time round so I used=
 a ball bearing for the pivot point=2C added=20
 the aluminum rod to help with vertical stabilization and used square hollo=
w tubing for the boom.
Do you see anything wrong with this setup? I want criticism / suggestions i=
f you have any.
http://www.1goss.com/s-bearing.jpg
http://www.1goss.com/s-top.jpg
http://www.1goss.com/s-overall.jpg
http://www.1goss.com/s-boom.jpg
http://www.1goss.com/s-housing.jpg
 I had a bit of trouble getting the 25sec period and am not sure it is corr=
ect and haven't had a recordable local or teleseismic event to compare with=
 the local=20
Helicorder Displays.

C. Would a ball bearing at the top and all aluminum preform better than a w=
ire? and if  I use all wire what is the very best?

Thanks for your time Bryan S Goss












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I have built a new lehman seismometer and I have a few questions its been s=
everal years since my last one and I have forgotten a lot.

A. I have=
 a small outdoor building not temperature controlled thats why I built the =
wooden box with insulation.
I am getting noise starting about 1:00am to =
about 9:00am 
should I build an outer box made of foam board and heat it=
 with a heating pad or something to control the temperature.
link to the=
 box and noise
http://www.1goss.com/s-box.jpg =3B 
noise example=
=2C I had it most of the afternoon although normally during the day it look=
s like it should.
http://www.1goss.com/noise.jpg

B. The first sen=
sor I built several years back I donated to the local elementary school whe=
n were moving.
It used the razor blade knife edge and steel all thread f=
or the boom and did not have the small aluminum rod I put in the new one.It worked well but I wanted to build a better one this time round so I us=
ed a ball bearing for the pivot point=2C added 
 the aluminum rod to hel=
p with vertical stabilization and used square hollow tubing for the boom.Do you see anything wrong with this setup? I want criticism / suggestions if you have any.=

http://www.1goss.com/s-bearing.jpg
http://www.1goss.com/s-top.jpghttp://www.1goss.com/s-overall.jpg
http://www.1goss.com/s-boom.jpg
h=
ttp://www.1goss.com/s-housing.jpg
 =3BI had a bit of trouble getting=
 the 25sec period and am not sure it is correct and haven't had a recordabl=
e local or teleseismic event to compare with the local 
Helicorder Displ=
ays.

C. Would a ball bearing at the top and all aluminum preform bet=
ter than a wire? and if =3B I use all wire what is the very best?
Thanks for your time Bryan S Goss











 		 	   		  
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