Hi everyone,

If you want a vertical and more access to seeing the early
and clearer "P" wave signals (and others), this might be the
machine for you.  Horizontals just don't pick up the early quake
signals quite as well.

With a adequate vault and temperature control, such a
instrument (at least for here experience wise), will probably
prove to be very dependable for low drift of the mass/boom.
The design came out in the 1950's-1960's or thereabouts.

I'd suspect that the seller won't adequately prepare it for
shipment, especially the boom/mass.  When I got mine
(many years ago), the pivot hinges were snapped, the cover viewing
glass was broken and all the thin diameter jumper signal/damping
wires were broken.  Relatively minor items to replace/repair.
Their could be real serious reason for it being surplus now (?).

Potentially the most serious/difficult problem "could" lie with the
two coils for damping/signal.  If they get thrown around and
damaged....their isn't any possible replacements.  The
coil wire it self can also break over time, due to a manufacturers
sudden coil winding speed shift (a type of copper wire stress or
stretch knot),  which I've noted on acouple coils over time.
Luckily they were both on the outside area of the coils, which
didn't mean too much unwinding too find.

Even in the worst case scenario (no working coils), the frame
and "zero length" spring would be enviable to have; let alone the
longer period vertical configuration.  One "might" have to adopt
other damping/signal means.

Note the weight of the unpacked instrument (115 pounds), the
shipping cost can be potentially higher than the winning bid price.
On the other hand, it "might" still be worthwhile to have even with
the tacked on costs...the massive solid aluminum frame and parts
are usually excellent material.

Be prepared to have to work on the brass setscrews (die), and
retap the aluminum base setscrew holes due to oxidation, old
dried up grease/dirt.  The tap and die could cost up to $100,
or thereabouts.

If you win the bid, I'd suggest that the buyer request that the
two mass weights be removed (unscrewed); the boom lock pin
installed, and the coil magnets assembly also be removed (gently);
and shipped separately, even if it means more cost initially to the
buyer.  Otherwise; if you can pick it up yourself, and prepare it
before moving....that would be the best alternate route.  The
risks and reward/s are with the buyer of course.

Take care, Meredith

Larry Cochrane wrote:

> Hi Everyone,
>
> Someone on EBay is selling one. See
> http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=1785642626
>
> I would bid on it but I don't need another sensor right now...
>
> -Larry Cochrane
> Redwood City, PSN
>


Hi everyone,
If you want a vertical and more access to seeing the early

and clearer "P" wave signals (and others), this might be the

machine for you.  Horizontals just don't pick up the early quake

signals quite as well.
With a adequate vault and temperature control, such a

instrument (at least for here experience wise), will probably

prove to be very dependable for low drift of the mass/boom.

The design came out in the 1950's-1960's or thereabouts.
I'd suspect that the seller won't adequately prepare it for

shipment, especially the boom/mass.  When I got mine

(many years ago), the pivot hinges were snapped, the cover viewing

glass was broken and all the thin diameter jumper signal/damping

wires were broken.  Relatively minor items to replace/repair.

Their could be real serious reason for it being surplus now (?).
Potentially the most serious/difficult problem "could" lie with the

two coils for damping/signal.  If they get thrown around and

damaged....their isn't any possible replacements.  The

coil wire it self can also break over time, due to a manufacturers

sudden coil winding speed shift (a type of copper wire stress or

stretch knot),  which I've noted on acouple coils over time.

Luckily they were both on the outside area of the coils, which

didn't mean too much unwinding too find.
Even in the worst case scenario (no working coils), the frame

and "zero length" spring would be enviable to have; let alone the

longer period vertical configuration.  One "might" have to adopt

other damping/signal means.
Note the weight of the unpacked instrument (115 pounds), the

shipping cost can be potentially higher than the winning bid price.

On the other hand, it "might" still be worthwhile to have even with

the tacked on costs...the massive solid aluminum frame and parts

are usually excellent material.
Be prepared to have to work on the brass setscrews (die), and

retap the aluminum base setscrew holes due to oxidation, old

dried up grease/dirt.  The tap and die could cost up to $100,

or thereabouts.
If you win the bid, I'd suggest that the buyer request that the

two mass weights be removed (unscrewed); the boom lock pin

installed, and the coil magnets assembly also be removed (gently);

and shipped separately, even if it means more cost initially to the

buyer.  Otherwise; if you can pick it up yourself, and prepare
it

before moving....that would be the best alternate route.  The

risks and reward/s are with the buyer of course.
Take care, Meredith
Larry Cochrane wrote:
Hi Everyone,
Someone on EBay is selling one. See

http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=1785642626
I would bid on it but I don't need another sensor right now...
-Larry Cochrane

Redwood City, PSN