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A full side view of the vertical. In this view the 2 mass plates have been installed. The looping metal strip on the back is a temperature compensation device, attached to the rear of the boom.
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The front of the boom with the 2 mass plates installed.
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Another side view of the seismometer with the 2 mass
plates installed.
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Another side view.
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A top view of the front of the seismometer looking
down
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The front view again, with the 2 mass plates installed.