Hi everyone,=20
If you want a vertical and more access to seeing the early
and=20
clearer "P" wave signals (and others), this might be the
machine =
for=20
you. Horizontals just don't pick up the early quake
signals =
quite=20
as well.=20
With a adequate vault and temperature control, such a
instrument=
(at=20
least for here experience wise), will probably
prove to be very=20
dependable for low drift of the mass/boom.
The design came out in =
the=20
1950's-1960's or thereabouts.=20
I'd suspect that the seller won't adequately prepare it for
=
shipment,=20
especially the boom/mass. When I got mine
(many years ago), =
the=20
pivot hinges were snapped, the cover viewing
glass was broken and =
all=20
the thin diameter jumper signal/damping
wires were broken. =20
Relatively minor items to replace/repair.
Their could be real =
serious=20
reason for it being surplus now (?).=20
Potentially the most serious/difficult problem "could" lie with the=
=20
two coils for damping/signal. If they get thrown around and=20
damaged....their isn't any possible replacements. The
=
coil=20
wire it self can also break over time, due to a manufacturers
=
sudden=20
coil winding speed shift (a type of copper wire stress or
stretch=20
knot), which I've noted on acouple coils over time.
Luckily =
they=20
were both on the outside area of the coils, which
didn't mean too =
much=20
unwinding too find.=20
Even in the worst case scenario (no working coils), the frame
=
and=20
"zero length" spring would be enviable to have; let alone the
=
longer=20
period vertical configuration. One "might" have to adopt
=
other=20
damping/signal means.=20
Note the weight of the unpacked instrument (115 pounds), the
=
shipping=20
cost can be potentially higher than the winning bid price.
On the =
other=20
hand, it "might" still be worthwhile to have even with
the tacked =
on=20
costs...the massive solid aluminum frame and parts
are usually =
excellent=20
material.=20
Be prepared to have to work on the brass setscrews (die), and
=
retap=20
the aluminum base setscrew holes due to oxidation, old
dried up=20
grease/dirt. The tap and die could cost up to $100,
or=20
thereabouts.=20
If you win the bid, I'd suggest that the buyer request that the
=
two=20
mass weights be removed (unscrewed); the boom lock pin
installed, =
and=20
the coil magnets assembly also be removed (gently);
and shipped=20
separately, even if it means more cost initially to the
buyer. =
;=20
Otherwise; if you can pick it up yourself, and prepare it
before=20
moving....that would be the best alternate route. The
risks =
and=20
reward/s are with the buyer of course.=20
Take care, Meredith=20
Larry Cochrane wrote:=20
Hi Everyone,=20
Someone on EBay is selling one. See
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=3D=
1785642626=20
I would bid on it but I don't need another sensor right now...=20
-Larry Cochrane
Redwood City, PSN=20