In a message dated 2006/11/30, tchannel@.............. writes:

> Nothing appears on the helicorer, except earthquakes, during the night.  So 
> I don't think the sensor is sticking etc, at night all is working perfectly.

Hi Ted,

       Increase the gain until you see the 5/6 second microseisms at maybe 50 
counts (I normally run at about 200 counts)

> The noise doesn't start exactly on the minute, each morning, I see no 
> pattern, other than the first noise starts around 8:37 am all day even on Sundays 
> and Holidays.  
> There is some sort of pumping? station one mile away, I don't even know what 
> it is but it has a large engine on a concrete slab, and a block building 
> next to the outdoor equipment.  Maybe I should drive over there at 8:33am, and 
> see if the ground shakes.

       I don't know what you are picking up, but this seems a likely 
candidate. Can you ring them up and ask when the work and what they do? Is there a 
guard on the entrance?

> Chris, Now on the zero length spring, do I understand that if I hang the 
> spring, add enough wt to start it to extend, then add 2# and measure, then add 
> another 2# and measure, continue doing this.........say the first 2# expanded 
> 1" the next 2# expanded another 1"
> If I did this 5 times, 2+2+2+2+2= 10#  The expansions would be 
> 1"+1"+1"+1"+1"= 5"?
> In other words the same force would be required to move the same distance 
> thought out the length of expansion?

       Correct. This is substantially true except at very large extensions 
when the wire spiral changes.

> If so, is this why they use a zero length springs on the vertical sensors 
> so movement is uniform?
> The length is not so important 20" vs 28" but it need so pull evenly, vs 
> easy at first and get harder at the end?

       The zero length spring effect is used so that the length of a 
triangular side is proportional to the force. This completes the traingle of forces to 
give an infinite period device.

       Regards,

       Chris Chapman
In a me=
ssage dated 2006/11/30, tchannel@.............. writes:



Nothing appears on the helicore=
r, except earthquakes, during the night.  So I don't think the sensor i=
s sticking etc, at night all is working perfectly.




Hi Ted,



       Increase the gain until you see the 5/6=
 second microseisms at maybe 50 counts (I normally run at about 200 counts)<=
/FONT>=




The noise doesn't start exactly=
 on the minute, each morning, I see no pattern, other than the first noise s=
tarts around 8:37 am all day even on Sundays and Holidays.  

There is some sort of pumping? station one mile away, I don't even know what=
 it is but it has a large engine on a concrete slab, and a block building ne=
xt to the outdoor equipment.  Maybe I should drive over there at 8:33am=
, and see if the ground shakes.




       I don't know what you are picking up,=20=
but this seems a likely candidate. Can you ring them up and ask when the wor=
k and what they do? Is there a guard on the entrance?



Chris, Now on the zero length s=
pring, do I understand that if I hang the spring, add enough wt to start it=20=
to extend, then add 2# and measure, then add another 2# and measure, continu=
e doing this.........say the first 2# expanded 1" the next 2# expanded anoth=
er 1"

If I did this 5 times, 2+2+2+2+2=3D 10#  The expansions would be 1"+1"+=
1"+1"+1"=3D 5"?

In other words the same force would be required to move the same distance th=
ought out the length of expansion?




       Correct. This is substantially true ex=
cept at very large extensions when the wire spiral changes.



If so, is this why they use a z=
ero length springs on the vertical sensors so movement is uniform?

The length is not so important 20" vs 28" but it need so pull evenly, vs eas=
y at first and get harder at the end?




       The zero length spring effect is used s=
o that the length of a triangular side is proportional to the force. This co=
mpletes the traingle of forces to give an infinite period device.



       Regards,



       Chris Chapman