World's Largest Wheatstone Bridge
in [Basics]
|
From: John Larkin on 3 May 2010 20:29 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 > Differential GPS and laser rangefinders make a lot more sense. John
From: krw on 3 May 2010 20:37 On Mon, 03 May 2010 17:29:32 -0700, John Larkin <jjlarkin(a)highNOTlandTHIStechnologyPART.com> wrote: >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 >> > >Differential GPS and laser rangefinders make a lot more sense. Sense? You're talking to Cahill, here.
From: John Larkin on 3 May 2010 20:44 On Mon, 03 May 2010 19:37:55 -0500, "krw(a)att.bizzzzzzzzzzzz" <krw(a)att.bizzzzzzzzzzzz> wrote: >On Mon, 03 May 2010 17:29:32 -0700, John Larkin ><jjlarkin(a)highNOTlandTHIStechnologyPART.com> wrote: > >>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 >>> >> >>Differential GPS and laser rangefinders make a lot more sense. > >Sense? You're talking to Cahill, here. oh. sorrreee. John
From: George Herold on 3 May 2010 21:40 On May 3, 8:44 pm, John Larkin <jjlar...(a)highNOTlandTHIStechnologyPART.com> wrote: > On Mon, 03 May 2010 19:37:55 -0500, "k...(a)att.bizzzzzzzzzzzz" > > > > > > <k...(a)att.bizzzzzzzzzzzz> wrote: > >On Mon, 03 May 2010 17:29:32 -0700, John Larkin > ><jjlar...(a)highNOTlandTHIStechnologyPART.com> wrote: > > >>On Mon, 3 May 2010 09:46:39 -0700 (PDT), Bret Cahill > >><BretCah...(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 > > >>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.
From: John Fields on 3 May 2010 22:22
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. --- 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 |