In a message dated 2008/02/15, jonfr@......... writes:

> 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.
> 
> I am going to use the BGS design, as it has the configuration numbers
> that the teacher needs to build the seismometer.

Hi Jon,

       I suggest that you download and read 
ftp://ftp.bgs.ac.uk/pubload/schoolseismology/SEP_CD/SSS_instructions_v1.pdf
       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. 
       You can buy 1/8" / 3mm Tungsten Carbide drills and use the shanks for 
the bearings 

       This should give you some ideas anyway!

       Regards,

       Chris Chapman   
In a me=
ssage dated 2008/02/15, jonfr@......... writes:



The teacher how is helping me b=
uilding 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.



I am going to use the BGS design, as it has the configuration numbers

that the teacher needs to build the seismometer.




Hi Jon,



       I suggest that you download and read ft=
p://ftp.bgs.ac.uk/pubload/schoolseismology/SEP_CD/SSS_instructions_v1.pdf
       The original version used 2.5" or 3" x=20=
1" U Channel Aluminum for the frame and  1/8" Al plate for the corners.=
 It used 6mm SS bolts. 

       You can buy 1/8" / 3mm Tungsten Carbide=
 drills and use the shanks for the bearings 



       This should give you some ideas anyway!=




       Regards,



       Chris Chapman