I have read that a ball bering was used in place of a knife edge in the =
construction of the Lehman by some people.
I used the knife edge, but have problems with it when trying to adjust, =
It seems to want to tilt then the boom does not have =3D swing in my =
case east and west. In most of my data one side has just a bit more =
amplitude than the other maybe 10% or less.
If I use a ball bering would this problem be corrected or is this normal =
to see my construction go here :http://www.1goss.com/seis.htm








I have read that a ball bering was used =
in place of=20
a knife edge in the construction of the Lehman by some =
people.
I used the knife edge, but have =
problems with it=20
when trying to adjust, It seems to want to tilt then the boom does not =
have =3D=20
swing in my case east and west. In =
most of my=20
data one side has just a bit more amplitude than the other maybe 10% or=20
less.
If I use a ball bering would this =
problem be=20
corrected or is this normal to see my construction go here :http://www.1goss.com/seis.htm<=
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