990605-001a
This Sprengnether seismometer is kind of like looking
at history in the 1950's into the 1960's. Big, bulky, heavy, but
with very sturdy construction. Note the massive mast and the sturdy
braces forward from it, to counteract the effects of the mass when the
earth (frame) moves. Nowadays, little is in, and big and bulky is
out....at least insofar as commercial production and those who can afford
the newer seismometers.
990605-002a
The mast and its mass suspension mechanisms.
The knurled black knob allows for raising or lowering the mass and boom.
990605-003a
A better view of the suspension wires. The upper
single wire leads into a clamp mechanism, and is tightened per the hex
bolt.
990605-004a
Another view of the mast suspension mechanism.
990605-005a
Note the suspension wire coupled to the mass.
This view is the same on both sides of the boom. The coil wire is
visibly lead to a terminal on the mass, and thereafter fed back to the
rear boom terminal.
990605-006a
A good rear view of the mass, coils, boom, terminals
and the suspension wires. On the suspension wire, it is clamped into
the collar which loosely is fitted over a metal projection, which also
supports the coils.