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Many thanks to Cris, Peter and George for the valued input.
Some of it quite a bit above my head but I feel I have already
learned something and hope to learn more if you are kind
enough to answer this posting.
Cris: I did not quite understand if the Neodymium "Super Mag"
is a magnetometer, gaussmeter, metal detector or what. Also
not clear if it is the same thing that sells for 99 Quid. I
can afford that amount so if it is simple enough that there is
a reading and a big reading is bad and a small reading is good
(or vice versa), I want one and would appreciate knowing where
I can get product literature and order one as I could find no
reference on the web.
I keep coming back to the "hand held digitial gaussmeter shown
at
http:www.ascscientific/gauss.html
and it seems to me that this or something similar would
work??? (Does anyone know why this web address does NOT
highlight and the one below DOES highlight???
Peter: The only item that I know of that shows it is
specifically to measure the "magnetic susceptibility" of
something is a rather pricey item (I think US$2000.00 or so)
made in Australia and found at
http://www.geoinstruments.com.au/main.html. I also know
TerraPlus and some other firms have them but I think price
even greater than that shown above.
At the risk (or probably certainty) of sounding really
stupid - is a "magnetic suceptibility meter" the same as a
"gaussmeter"???
George: Your method sounds like the most exciting of the
bunch, but considering the knowledge base that I am starting
from and the fact that I am the only man in the world who has
frittered away six months and haven't even selected my
toroidal form yet, if I got started on your project, I'd be
six feet (1.82880 metres) under before I finished. I am not
depreciating or denigrating your greatly appreciated answer -
only trying to interject a bit of humor into MY own personal
failings. Or possibly "LMF".
Again thanks and very best regards to all,
Dale
PS I regret boring you with these things you all know so well
but I just can't seem to learn it from books. In fact for
whatever reason I cannot even read a full page in a technical
book anymore without my mind wandering so bad that I start
the same page five times before I give up.
----- Original Message -----
From: "George Davidson"
To: "The Proton Mag Forum"
Sent: Thursday, June 15, 2000 11:40 AM
Subject: Re: tests for magnetic materials
> The Proton Mag Forum
>
> Mag forum,
>
> Another angle:
>
> Am late on this discussion as I have been maggin in
Mocambique
> and have returned without malaria, cholera or yellow fever.
>
> I have wound a number of coils mostly solenoids and found a
> simple test for magnetic buildup which may be useful, as
follows:
>
> In the field, a magnetized solenoid will show a deviation if
swung
> from E-W to W-E, at worst up to 5 nT . Couldnt find any
effect
> of ferrous contaminated Cu wire and assumed it would cancel
> itself out within the wire**. Did get deviations when
mag probes
> were rubbing against anchor chain in the bilges of the boat
or
> dragged across a warehouse floor or deck of a steel survey
vessel.
>
> The test system I used was a hollow solenoid into which a
bottle
> could be placed for testing the various fluids and over
which a
> PVC housing with various plastics could be tested . Ran it
> overnight at 2 A from 24v DC to get some serious
polarization and
> tested it in the field on top of a 3 Metre wooden pole
which could
> be rotated and the trace observed. Using a notebook and a
> PICOSCOPE oscilloscope a number of measurements of various
> type s could be obtained
> . After that one can use the least offensive of the
various
> materials from the same stocks to build the final toroid
etc.
>
> I like the idea of bifilar windings but always think of the
field
> situation like what cable to use and where the earth will
be .
> Cable is always a problem and stray voltages on a boat can
realy
> become a character -building experience. In addition
,cables can
> be microphonic and change capacitance (pF) with wave
action ...
>
> George
>
> **PS Quiz: a ferrous particle in the very centre of a
current
> carrying copper wire will become polarized in which
direction?
>
>
>
__________________________________________________ ____________
________
Some of it quite a bit above my head but I feel I have already
learned something and hope to learn more if you are kind
enough to answer this posting.
Cris: I did not quite understand if the Neodymium "Super Mag"
is a magnetometer, gaussmeter, metal detector or what. Also
not clear if it is the same thing that sells for 99 Quid. I
can afford that amount so if it is simple enough that there is
a reading and a big reading is bad and a small reading is good
(or vice versa), I want one and would appreciate knowing where
I can get product literature and order one as I could find no
reference on the web.
I keep coming back to the "hand held digitial gaussmeter shown
at
http:www.ascscientific/gauss.html
and it seems to me that this or something similar would
work??? (Does anyone know why this web address does NOT
highlight and the one below DOES highlight???
Peter: The only item that I know of that shows it is
specifically to measure the "magnetic susceptibility" of
something is a rather pricey item (I think US$2000.00 or so)
made in Australia and found at
http://www.geoinstruments.com.au/main.html. I also know
TerraPlus and some other firms have them but I think price
even greater than that shown above.
At the risk (or probably certainty) of sounding really
stupid - is a "magnetic suceptibility meter" the same as a
"gaussmeter"???
George: Your method sounds like the most exciting of the
bunch, but considering the knowledge base that I am starting
from and the fact that I am the only man in the world who has
frittered away six months and haven't even selected my
toroidal form yet, if I got started on your project, I'd be
six feet (1.82880 metres) under before I finished. I am not
depreciating or denigrating your greatly appreciated answer -
only trying to interject a bit of humor into MY own personal
failings. Or possibly "LMF".
Again thanks and very best regards to all,
Dale
PS I regret boring you with these things you all know so well
but I just can't seem to learn it from books. In fact for
whatever reason I cannot even read a full page in a technical
book anymore without my mind wandering so bad that I start
the same page five times before I give up.
----- Original Message -----
From: "George Davidson"
To: "The Proton Mag Forum"
Sent: Thursday, June 15, 2000 11:40 AM
Subject: Re: tests for magnetic materials
> The Proton Mag Forum
>
> Mag forum,
>
> Another angle:
>
> Am late on this discussion as I have been maggin in
Mocambique
> and have returned without malaria, cholera or yellow fever.
>
> I have wound a number of coils mostly solenoids and found a
> simple test for magnetic buildup which may be useful, as
follows:
>
> In the field, a magnetized solenoid will show a deviation if
swung
> from E-W to W-E, at worst up to 5 nT . Couldnt find any
effect
> of ferrous contaminated Cu wire and assumed it would cancel
> itself out within the wire**. Did get deviations when
mag probes
> were rubbing against anchor chain in the bilges of the boat
or
> dragged across a warehouse floor or deck of a steel survey
vessel.
>
> The test system I used was a hollow solenoid into which a
bottle
> could be placed for testing the various fluids and over
which a
> PVC housing with various plastics could be tested . Ran it
> overnight at 2 A from 24v DC to get some serious
polarization and
> tested it in the field on top of a 3 Metre wooden pole
which could
> be rotated and the trace observed. Using a notebook and a
> PICOSCOPE oscilloscope a number of measurements of various
> type s could be obtained
> . After that one can use the least offensive of the
various
> materials from the same stocks to build the final toroid
etc.
>
> I like the idea of bifilar windings but always think of the
field
> situation like what cable to use and where the earth will
be .
> Cable is always a problem and stray voltages on a boat can
realy
> become a character -building experience. In addition
,cables can
> be microphonic and change capacitance (pF) with wave
action ...
>
> George
>
> **PS Quiz: a ferrous particle in the very centre of a
current
> carrying copper wire will become polarized in which
direction?
>
>
>
__________________________________________________ ____________
________