Lehman seismometer movement


Chris,
Make a conventional Lehman (500 mm boom). =20
Take a tiny front-surface mirror and make a separate, small, torsion=20
uspension for it with a 1 cm lever.  Lightly couple (#46 wire?) the=20
0 mm mirror lever directly to the mass of the Lehman=20
o that when the Lehman mass "moves" the mirror is rotated on its=20
separate) axis.
It's like a Wood-Anderson suspension/mirror coupled to a Lehman mass.
If words have failed me again, I'll post a sketch.=20
Hi Jack,
    I can visualise how you can pull the mirror, but NOT how
you can push it! The coupling needs to exert a zero force on
the mass. The centralising force is milli grams per degree=20
for a 1 kilo mass.
    Regards,
    Chris=20





=
Lehman seismometer movement





Chris,

Make a conventional Lehman (500 mm boom). =20

Take a tiny front-surface mirror and make a separate, small, torsion=20
suspension for it with a 1 cm lever.  Lightly couple (#46 wire?) the=20
10 mm mirror lever directly to the mass of the Lehman=20
so that when the Lehman mass "moves" the mirror is rotated on its=20
(separate) axis.

It's like a Wood-Anderson suspension/mirror coupled to a Lehman mass.

If words have failed me again, I'll post a sketch. 
Hi Jack,
    I can visualise how you can pull th=
e mirror, but NOT how
you can push it! The coupling needs to exert a zero force on
the mass. =
The centralising force is milli grams per degree 
for a 1 kilo mass.
    Regards,
    Chris