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From: Bret Cahill on 3 May 2010 12:46
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


From: Sjouke Burry on 3 May 2010 13:13
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
From: jimp on 3 May 2010 13:07
In sci.physics Bret Cahill <BretCahill(a)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.
From: Bret Cahill on 3 May 2010 13:37
> > 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

From: Helmut Wabnig hwabnig on 3 May 2010 13:36
On Mon, 3 May 2010 09:46:39 -0700 (PDT), Bret Cahill
<BretCahill(a)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.
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