990603-019a
Another view down the boom, just over the centering/clamping block.
990603-020a
A view of the top adjustment and clamping knurled
and hand tightening setscrews.
990603-021a
Another view of the rear of the seismometer boom.
One can vaguely see the fine bridging wire crossing from the boom to the
base upright terminals.
990603-022a
An underneath view of the top adjustment screw area.
990603-023a
Another rear view of the boom, terminals, and the
push in rod to prevent boom movement till ready for operation.
990603-024a
Another top view of the spring clamping mechanism.