In a message dated 09/04/03, dyouden@......... writes:

> Has anyone out there ever built a tiltmeter based on a simple balance beam? 
> What can you tell me about it?

Hi Dave,

       Have an initial look at http://www.ecgs.lu/html/labo/labo_main.html to 
get a general idea of what the professionals use for measuring tilts. If you 
call up http://www.ecgs.lu/ you can click onto the publications and there is 
at least one long paper which is worth downloading by Nicolas d'Oreye and 
several other references.

       'Ground tilt seismic spectrum measured with a new high sensitivity 
rotational spectrometer'. A N Luiten & Al. Rev.Sci. Instrum. V 68 (4), April 
1997  pp 1889-1893 has a sensitive beam balance system and it is somewhere on 
the Web. I downloaded it, but am not now sure from where. Can let you have a 
copy if you can't find it. Depends on how sensitive you want it to be. Sean 
Morrissey's tiltmeter had a limit of about 0.1 nano radian. See his website.

       See also the 'standard' complete review 'Strainmeters and Tiltmeters' 
by Duncan Carr Agnew, Reviews of Geophys. V24 (3) pp579-624 1986 

       You might also be interested in R. Peters, ``Mechanically adjustable 
balance and sensitive tiltmeter", Meas. Sci. Technol. 1, 1131 (1990) 

       Regards,

       Chris Chapman





In a message dated 09/04/=
03, dyouden@......... writes:



Has anyone out there ever b=
uilt a tiltmeter based on a simple balance beam?=20

What can you tell me about it?




Hi Dave,



       Have an initial look at http://www.=
ecgs.lu/html/labo/labo_main.html to get a general idea of what the professio=
nals use for measuring tilts. If you call up http://www.ecgs.lu/ you can cli=
ck onto the publications and there is at least one long paper which is worth=
 downloading by Nicolas d'Oreye and several other references.



       'Ground tilt seismic spectrum measu=
red with a new high sensitivity rotational spectrometer'. A N Luiten & A=
l. Rev.Sci. Instrum. V 68 (4), April 1997  pp 1889-1893 has a sensitive=
 beam balance system and it is somewhere on the Web. I downloaded it, but am=
 not now sure from where. Can let you have a copy if you can't find it. Depe=
nds on how sensitive you want it to be. Sean Morrissey's tiltmeter had a lim=
it of about 0.1 nano radian. See his website.



       See also the 'standard' complete re=
view 'Strainmeters and Tiltmeters' by Duncan Carr Agnew, Reviews of Geophys.=
 V24 (3) pp579-624 1986=20



       You might also be interested in R.=20=
Peters, ``Mechanically adjustable balance and sensitive tiltmeter", Meas. Sc=
i. Technol. 1, 1131 (1990)=20



       Regards,



       Chris Chapman