Hi

Thanks for this. I have printed out the guide to show the teacher. It is
cheaper for me build it then buy it.=20

Regards.
J=F3n Fr=EDmann.

On Fri, 2008-02-15 at 14:59 -0500, ChrisAtUpw@....... wrote:
> In a message dated 2008/02/15, jonfr@......... writes:
>=20
> > The teacher how is helping me building the seismometer wants to know
> > what type of material is best to use in the seismometer. He was
> > wondering about iron or steel, maybe aluminum. But as I am not sure
> > so I
> > was unable to give him good answer. He was also wondering about the
> > arm
> > that holds them mass up, what it should me made out of.
> >=20
> > I am going to use the BGS design, as it has the configuration
> > numbers
> > that the teacher needs to build the seismometer.
>=20
>=20
> Hi Jon,
>=20
>        I suggest that you download and read
> ftp://ftp.bgs.ac.uk/pubload/schoolseismology/SEP_CD/SSS_instructions_v1.p=
df
>        The original version used 2.5" or 3" x 1" U Channel Aluminum
> for the frame and  1/8" Al plate for the corners. It used 6mm SS
> bolts.=20
>        You can buy 1/8" / 3mm Tungsten Carbide drills and use the
> shanks for the bearings=20
>=20
>        This should give you some ideas anyway!
>=20
>        Regards,
>=20
>        Chris Chapman=20

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