The discussion of the effects of spring vibration made me look up the following paragraph from the Physics section of the downloaded manual. It seems that vibration has no first order effect on vertical sensor performance if the spring is zero length. Bob LaCoste & Romberg INSTRUCTION MANUAL MODEL G & D GRAVITY METERS _Http://www.LaCosteRomberg.com_ (http://www.LaCosteRomberg.com) "An important feature of the zero length spring suspension is its insensitivity to longitudinal and transverse vibrations (Harrison 1960, LaCoste 1967). Consider the spring to be made of identical masses with segments of weightless zero length spring between the masses. The top end of the spring is attached to A and the bottom to B. Since the spring segments are zero length springs, the forces each spring exerts on the adjacent masses are proportional to the spring length. Therefore, if the masses are equally spaced vertically, the vertical component of force exerted on each mass will be zero regardless of its horizontal position or horizontal motion. Also, the vertical components of force are proportional to the vertical component of spring length. (The vertical component of the force vector remains the same.) Also, the vertical force on A and B will be independent of any horizontal motions." ************************************** Get a sneak peek of the all-new AOL at http://discover.aol.com/memed/aolcom30tourThe discussion of the effects of spring vibration made me look up the=20 following paragraph from the Physics section of the downloaded manual. It se= ems=20 that vibration has no first order effect on vertical sensor performance if t= he=20 spring is zero length.BobLaCoste & Romberg
INSTRUCTION MANUAL
MODEL G & D GRAVITY=20 METERS
Http://www.LaCosteRomberg.com
"An important feature of the zero length spring suspension is=20 its
insensitivity to longitudinal and transverse vibrations=20 (Harrison
1960, LaCoste 1967). Consider the spring to be made of=20 identical
masses with segments of weightless zero length spring between=20 the
masses. The top end of the spring is attached to A and the bottom
= to=20 B. Since the spring segments are zero length springs, the forces
each spr= ing=20 exerts on the adjacent masses are proportional to the
spring length.=20 Therefore, if the masses are equally spaced vertically,
the vertical=20 component of force exerted on each mass will be
zero regardless of its=20 horizontal position or horizontal motion.
Also, the vertical components o= f=20 force are proportional to the
vertical component of spring length. (The=20 vertical component of
the force vector remains the same.) Also, the verti= cal=20 force on A
and B will be independent of any horizontal=20 motions."
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