World's Largest Wheatstone Bridge

[Bret Cahill]

String a wire back and forth across / along a fault line to measure
very small displacements in the earth's surface. If the resistance
and/or tensile strength needs to be higher than a common single alloy
wire then structural steel cable could be wrapped around a insulated
wire with a higher resistivity. It could be temperature compensated
as usual, with another wire of the same length loosely supported
nearby in another leg of the bridge.

An abandoned power line may be good to go if it is properly located.

Good info sometimes comes in small displacements.


Bret Cahill

 

In sci.physics Bret Cahill <BretCahill@peoplepc.com> wrote:

String a wire back and forth across / along a fault line to measure
very small displacements in the earth's surface. If the resistance
and/or tensile strength needs to be higher than a common single alloy
wire then structural steel cable could be wrapped around a insulated
wire with a higher resistivity. It could be temperature compensated
as usual, with another wire of the same length loosely supported
nearby in another leg of the bridge.

An abandoned power line may be good to go if it is properly located.

Good info sometimes comes in small displacements.


Bret Cahill

Typical Cahill comic book nonsense.


--
Jim Pennino

Remove .spam.sux to reply.

 

[Sjouke Burry]

Bret Cahill wrote:

String a wire back and forth across / along a fault line to measure
very small displacements in the earth's surface. If the resistance
and/or tensile strength needs to be higher than a common single alloy
wire then structural steel cable could be wrapped around a insulated
wire with a higher resistivity. It could be temperature compensated
as usual, with another wire of the same length loosely supported
nearby in another leg of the bridge.

An abandoned power line may be good to go if it is properly located.

Good info sometimes comes in small displacements.


Bret Cahill


Two gps stations on both sides do the same trick

 

[Helmut Wabnig]

On Mon, 3 May 2010 09:46:39 -0700 (PDT), Bret Cahill
<BretCahill@peoplepc.com> wrote:

String a wire back and forth across / along a fault line to measure
very small displacements in the earth's surface. If the resistance
and/or tensile strength needs to be higher than a common single alloy
wire then structural steel cable could be wrapped around a insulated
wire with a higher resistivity. It could be temperature compensated
as usual, with another wire of the same length loosely supported
nearby in another leg of the bridge.

An abandoned power line may be good to go if it is properly located.

Good info sometimes comes in small displacements.


Bret Cahill

You cannot get a good enought temperature (and other factors)

compensation with such a setup.
A bird sitting on the wire would trigger a massive earthquake alarm,
and the evacuation of San Francisco and Los Angeles and every
clay hut in between, for example.

Sorry Bret, to disappoint you.

w.

 

In sci.physics Bret Cahill <BretCahill@peoplepc.com> wrote:

String a wire back and forth across / along a fault line to measure
very small displacements in the earth's surface.  If the resistance
and/or tensile strength needs to be higher than a common single alloy
wire then structural steel cable could be wrapped around a insulated
wire with a higher resistivity.  It could be temperature compensated
as usual, with another wire of the same length loosely supported
nearby in another leg of the bridge.

An abandoned power line may be good to go if it is properly located.

Good info sometimes comes in small displacements.

Bret Cahill

You cannot get a good enought temperature (and other factors)
compensation with such a setup.

Compensation for temp. and other factors is easy: Just loosely wrap
another identical wire around the taught wire and shield and insulate
it for another leg of the bridge.

Wind.

Yet more silly, comic book engineering to solve a problem solved a long
time ago.

The challenge to monitoring such stuff isn't an engineering problem, it is
an economic problem.



--
Jim Pennino

Remove .spam.sux to reply.

 

[Sjouke Burry]

Bret Cahill wrote:

String a wire back and forth across / along a fault line to measure
very small displacements in the earth's surface. If the resistance
and/or tensile strength needs to be higher than a common single alloy
wire then structural steel cable could be wrapped around a insulated
wire with a higher resistivity. It could be temperature compensated
as usual, with another wire of the same length loosely supported
nearby in another leg of the bridge.
An abandoned power line may be good to go if it is properly located.
Good info sometimes comes in small displacements.
Bret Cahill
Two gps stations on both sides do the same trick

What's the smallest displacement -- not movement but actual change in
_distance_ between two points -- they can measure?


Bret Cahill

They measure continental drift with them in cm's per year....

 

[Bret Cahill]

String a wire back and forth across / along a fault line to measure
very small displacements in the earth's surface.  If the resistance
and/or tensile strength needs to be higher than a common single alloy
wire then structural steel cable could be wrapped around a insulated
wire with a higher resistivity.  It could be temperature compensated
as usual, with another wire of the same length loosely supported
nearby in another leg of the bridge.

An abandoned power line may be good to go if it is properly located.

Good info sometimes comes in small displacements.

Bret Cahill

Two gps stations on both sides do the same trick

What's the smallest displacement -- not movement but actual change in
_distance_ between two points -- they can measure?


Bret Cahill

 

[Cwatters]

"Bret Cahill" <BretCahill@peoplepc.com> wrote in message
news:dc103c5f-bec3-4b24-afcf-5a02c8eb89ff@g5g2000pre.googlegroups.com...

String a wire back and forth across / along a fault line to measure
very small displacements in the earth's surface. If the resistance
and/or tensile strength needs to be higher than a common single alloy
wire then structural steel cable could be wrapped around a insulated
wire with a higher resistivity. It could be temperature compensated
as usual, with another wire of the same length loosely supported
nearby in another leg of the bridge.

An abandoned power line may be good to go if it is properly located.

Good info sometimes comes in small displacements.


Bret Cahill

Use a laser and a mirror.

They already measure the distance from earth to the moon that way to a few
cm.

 

[Bret Cahill]

String a wire back and forth across / along a fault line to measure
very small displacements in the earth's surface.  If the resistance
and/or tensile strength needs to be higher than a common single alloy
wire then structural steel cable could be wrapped around a insulated
wire with a higher resistivity.  It could be temperature compensated
as usual, with another wire of the same length loosely supported
nearby in another leg of the bridge.

An abandoned power line may be good to go if it is properly located.

Good info sometimes comes in small displacements.

Bret Cahill

You cannot get a good enought temperature (and other factors)
compensation with such a setup.

Compensation for temp. and other factors is easy: Just loosely wrap
another identical wire around the taught wire and shield and insulate
it for another leg of the bridge.

A bird sitting on the wire

They may have to use fake owls or bury it underground.

would trigger a massive earthquake alarm, and the evacuation of San Francisco and Los Angeles and every
clay hut in between, for example.

The data wouldn't be made available to the general public until after
it was studied and determined to be useful in predicting earthquakes.

Supposing 95% of a certain kind of fault line gives some kind of micro
displacement warning an hour or so in advance of an M 8.0?

Wouldn't that be worth an investigation?

The World's Largest Strain Gage might turn out to be pretty cost
effective at saving lives and property.


Bret Cahill

 

[Bob Eld]

"Bret Cahill" <BretCahill@peoplepc.com> wrote in message
news:dc103c5f-bec3-4b24-afcf-5a02c8eb89ff@g5g2000pre.googlegroups.com...

String a wire back and forth across / along a fault line to measure
very small displacements in the earth's surface. If the resistance
and/or tensile strength needs to be higher than a common single alloy
wire then structural steel cable could be wrapped around a insulated
wire with a higher resistivity. It could be temperature compensated
as usual, with another wire of the same length loosely supported
nearby in another leg of the bridge.

An abandoned power line may be good to go if it is properly located.

Good info sometimes comes in small displacements.


Bret Cahill

What you are trying to make is a strain gauge. This scheme wont work because
the gauge has to be attached to the substrate along it's whole length not
just strung up like a power line. But attaching it to the earth in any
meaningful way over distance would be next to impossible. Yes, you can
compensate for the temperature coefficient of resistance but how do you
compensate for the change in length due to temperature, coefficient of
expansion, a very different animal. I can't see a strain gauge being a
solution for seismic motions.

The best way is a laser interferometer for small displacements and GPS or
gross measurements. Only two points need to be attached to the earth with
these schemes.

 

[John Larkin]

On Mon, 3 May 2010 09:46:39 -0700 (PDT), Bret Cahill
<BretCahill@peoplepc.com> wrote:

String a wire back and forth across / along a fault line to measure
very small displacements in the earth's surface. If the resistance
and/or tensile strength needs to be higher than a common single alloy
wire then structural steel cable could be wrapped around a insulated
wire with a higher resistivity. It could be temperature compensated
as usual, with another wire of the same length loosely supported
nearby in another leg of the bridge.

An abandoned power line may be good to go if it is properly located.

Good info sometimes comes in small displacements.


Bret Cahill

Differential GPS and laser rangefinders make a lot more sense.

John

 

[krw@att.bizzzzzzzzzzzz]

On Mon, 03 May 2010 17:29:32 -0700, John Larkin
<jjlarkin@highNOTlandTHIStechnologyPART.com> wrote:

On Mon, 3 May 2010 09:46:39 -0700 (PDT), Bret Cahill
BretCahill@peoplepc.com> wrote:

String a wire back and forth across / along a fault line to measure
very small displacements in the earth's surface. If the resistance
and/or tensile strength needs to be higher than a common single alloy
wire then structural steel cable could be wrapped around a insulated
wire with a higher resistivity. It could be temperature compensated
as usual, with another wire of the same length loosely supported
nearby in another leg of the bridge.

An abandoned power line may be good to go if it is properly located.

Good info sometimes comes in small displacements.


Bret Cahill


Differential GPS and laser rangefinders make a lot more sense.

Sense? You're talking to Cahill, here.

 

[John Larkin]

On Mon, 03 May 2010 19:37:55 -0500, "krw@att.bizzzzzzzzzzzz"
<krw@att.bizzzzzzzzzzzz> wrote:

On Mon, 03 May 2010 17:29:32 -0700, John Larkin
jjlarkin@highNOTlandTHIStechnologyPART.com> wrote:

On Mon, 3 May 2010 09:46:39 -0700 (PDT), Bret Cahill
BretCahill@peoplepc.com> wrote:

String a wire back and forth across / along a fault line to measure
very small displacements in the earth's surface. If the resistance
and/or tensile strength needs to be higher than a common single alloy
wire then structural steel cable could be wrapped around a insulated
wire with a higher resistivity. It could be temperature compensated
as usual, with another wire of the same length loosely supported
nearby in another leg of the bridge.

An abandoned power line may be good to go if it is properly located.

Good info sometimes comes in small displacements.


Bret Cahill


Differential GPS and laser rangefinders make a lot more sense.

Sense? You're talking to Cahill, here.

oh. sorrreee.

John

 

[John Fields]

On Mon, 3 May 2010 09:46:39 -0700 (PDT), Bret Cahill
<BretCahill@peoplepc.com> wrote:

String a wire back and forth across / along a fault line to measure
very small displacements in the earth's surface. If the resistance
and/or tensile strength needs to be higher than a common single alloy
wire then structural steel cable could be wrapped around a insulated
wire with a higher resistivity. It could be temperature compensated
as usual, with another wire of the same length loosely supported
nearby in another leg of the bridge.

An abandoned power line may be good to go if it is properly located.

Good info sometimes comes in small displacements.

---
Oh, My...

To call you an idiot would be kind, since there's nothing in any of your
posts which suggests that you even know how a Wheatstone bridge works
and, from your latest, the proof that you don't is in the pudding.

Uncle Al is right, as usual.


JF

 

[Michael A. Terrell]

"krw@att.bizzzzzzzzzzzz" wrote:

On Mon, 03 May 2010 17:29:32 -0700, John Larkin
jjlarkin@highNOTlandTHIStechnologyPART.com> wrote:

On Mon, 3 May 2010 09:46:39 -0700 (PDT), Bret Cahill
BretCahill@peoplepc.com> wrote:

String a wire back and forth across / along a fault line to measure
very small displacements in the earth's surface. If the resistance
and/or tensile strength needs to be higher than a common single alloy
wire then structural steel cable could be wrapped around a insulated
wire with a higher resistivity. It could be temperature compensated
as usual, with another wire of the same length loosely supported
nearby in another leg of the bridge.

An abandoned power line may be good to go if it is properly located.

Good info sometimes comes in small displacements.


Bret Cahill


Differential GPS and laser rangefinders make a lot more sense.

Sense? You're talking to Cahill, here.

AKA: The world's biggest loaded dummy.


--
Anyone wanting to run for any political office in the US should have to
have a DD214, and a honorable discharge.

 

[John Larkin]

On Mon, 3 May 2010 19:39:58 -0700 (PDT), Bret Cahill
<BretCahill@peoplepc.com> wrote:

String a wire back and forth across / along a fault line to measure
very small displacements in the earth's surface.  If the resistance
and/or tensile strength needs to be higher than a common single alloy
wire then structural steel cable could be wrapped around a insulated
wire with a higher resistivity.  It could be temperature compensated
as usual, with another wire of the same length loosely supported
nearby in another leg of the bridge.
An abandoned power line may be good to go if it is properly located.
Good info sometimes comes in small displacements.
Bret Cahill
Two gps stations on both sides do the same trick

What's the smallest displacement -- not movement but actual change in
_distance_ between two points -- they can measure?

Bret Cahill

They measure continental drift with them in cm's per year....

The warning might be in microns.


Bret Cahill

What warning? Faults creep all the time. Knowing the rate of creep has
zero useful predictive value.

John

 

[Uncle Al]

Bret Cahill wrote:

String a wire back and forth across / along a fault line to measure
very small displacements in the earth's surface.
[snip reat of crap

1) Laser interferometer.
2) GPS.
3) Multiple quasar fix.
4) idiot

--
Uncle Al
http://www.mazepath.com/uncleal/
(Toxic URL! Unsafe for children and most mammals)
http://www.mazepath.com/uncleal/qz4.htm

 

[Androcles]

"Bret Cahill" <BretCahill@peoplepc.com> wrote in message
news:cbd8dbe2-93eb-4ed1-ac8c-08b4e000ac69@11g2000prw.googlegroups.com...

String a wire back and forth across / along a fault line to measure
very small displacements in the earth's surface. If the resistance
and/or tensile strength needs to be higher than a common single alloy
wire then structural steel cable could be wrapped around a insulated
wire with a higher resistivity. It could be temperature compensated
as usual, with another wire of the same length loosely supported
nearby in another leg of the bridge.

An abandoned power line may be good to go if it is properly located.

Good info sometimes comes in small displacements.

Bret Cahill

What you are trying to make is a strain gauge. This scheme wont work
because
the gauge has to be attached to the substrate along it's whole length not
just strung up like a power line. But attaching it to the earth in any
meaningful way over distance would be next to impossible.

Tie it down every few feet.
===========================================
Do manual work in a dust storm or rainstorm?
That was one of your objections to laser ranging, right?
'Faced with changing one's mind, or proving that there is no need to do so,
most people get busy on the proof.'- John Kenneth Galbraith
'There is nothing so easy but that it becomes difficult when you do it with
reluctance.'- Marcus Tullius Cicero

 

[George Herold]

On May 3, 8:44 pm, John Larkin
<jjlar...@highNOTlandTHIStechnologyPART.com> wrote:

On Mon, 03 May 2010 19:37:55 -0500, "k...@att.bizzzzzzzzzzzz"





k...@att.bizzzzzzzzzzzz> wrote:
On Mon, 03 May 2010 17:29:32 -0700, John Larkin
jjlar...@highNOTlandTHIStechnologyPART.com> wrote:

On Mon, 3 May 2010 09:46:39 -0700 (PDT), Bret Cahill
BretCah...@peoplepc.com> wrote:

String a wire back and forth across / along a fault line to measure
very small displacements in the earth's surface.  If the resistance
and/or tensile strength needs to be higher than a common single alloy
wire then structural steel cable could be wrapped around a insulated
wire with a higher resistivity.  It could be temperature compensated
as usual, with another wire of the same length loosely supported
nearby in another leg of the bridge.

An abandoned power line may be good to go if it is properly located.

Good info sometimes comes in small displacements.

Bret Cahill

Differential GPS and laser rangefinders make a lot more sense.

Sense? You're talking to Cahill, here.

oh. sorrreee.

John- Hide quoted text -

- Show quoted text -

And still, sensing the earth shake, doesn't tell you ... . .??? there
is all sorts of low level shaking going on. How many 5.0 earth quakes
per year? And how big is the shake from a 18 wheel semi going by your
site.. or logging going on near by....(tale from Ligo)

George H.

 

[John Larkin]

On Mon, 3 May 2010 20:01:47 -0700 (PDT), Bret Cahill
<BretCahill@peoplepc.com> wrote:

String a wire back and forth across / along a fault line to measure
very small displacements in the earth's surface.  If the resistance
and/or tensile strength needs to be higher than a common single alloy
wire then structural steel cable could be wrapped around a insulated
wire with a higher resistivity.  It could be temperature compensated
as usual, with another wire of the same length loosely supported
nearby in another leg of the bridge.
An abandoned power line may be good to go if it is properly located.
Good info sometimes comes in small displacements.
Bret Cahill
Two gps stations on both sides do the same trick

What's the smallest displacement -- not movement but actual change in
_distance_ between two points -- they can measure?

Bret Cahill

They measure continental drift with them in cm's per year....

The warning might be in microns.

Bret Cahill

What warning? Faults creep all the time.

At constant speed?

If that were true all the acceleration measurements published by USGS
or Cal Tech on the web in real time would always be zero.

There may be some characteristic behaviour of certain faults that
could be highly reliable early warning info.

Knowing the rate of creep has
zero useful predictive value.

Has this been proven over long distances measuring displacements of a
few thousandths of an inch?


Bret Cahill

Nobody is making useful earthquake predictions. It's probably
impossible. A superficial surface measurement is obviously
insufficient to understand an immensely complex and chaotic subsurface
3D system.

John