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Documentation for Long Period Vertical Seismograph |
PHOTO 2
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LaCoste and Romberg Model G Gravity Meter*
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Concept drawing of L&R Model G Gravity Meter*
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Dan's replica of LaCoste's seismograph
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A comparison of a gravity meter sensor and the long
period vertical seismograph reveals similar systems.
Note that the seismograph is about 15-times larger and
that the spring of the gravity meter is surrounded by a
cage. The mass of the gravity meter is hidden by
the optics on the lower left. The dome-like device on
the gravity meter beam is for barometric compensation.
The drawing shows some of the additional components required of a gravity meter, but not the dampers shown in the photograph below each end of the beam. |
I will admit my interest in this seismograph project
comes from being an employee of LaCoste and Romberg
from 1964 through 1994 and learning from Dr. LaCoste
for 22 of those years.
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*Ref: LaCoste and Romberg Model G
Gravity Meter Instruction Manual
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