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I just acquired a powerful treasure magnet with 200 pounds plus pulling power. Although it will only pull to iron objects, it reminded me of seeing ADS in the 1970's?, describing a GOLD MAGNET. I WAS WONDERING WITH ALL THE TECHNICAL KNOWLEDGE ON THIS FORUM IF THAT IS POSSIBLE OR WAS IT JUST A SCHAM or gimmick. Too bad it would be nice if it was possible....
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Gold is not attracted to a magnet, so the advert was either a scam or just a marketing gimmick.Originally posted by Joe(TX) View Post -
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Years ago, a fellow asked me about an article for building a gold magnet. I said, "No way, impossible." Then, one day, I actually found the article. It was an electromagnet that used AC, not DC. I don't recall, but I'll guess that at the frequency it used, the induced eddy currents in the gold had enough phase shift to produce a magnetic field phase that was attracted to the coil's field.
Now I can't remember where the article was published.
- CarlComment
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GOLD MAGNET
Not sure of where I saw the ad, it may have been in Popular Mechanics or Popular Electronics in the early 1970's?Comment
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There is a Gold Magnet advertised here -> http://store.goldfeverprospecting.com/bigorgomabsa.html
but I guess that's not the same thing.
Or you can buy yourself a certificate from the Gold Magnet and Mining Company -> http://www.scripophily.net/gomaandmicom.html. Lots of other interesting certificates here as well.
Of course, you may be thinking of the Ranger-Tell Examiner
which claims "The Examiner behaves like a gold magnet due to the unique aerial electronics."
I also read somewhere that someone was claiming that gold could be turned from diamagnetic to magnetic by applying an out of phase electromagnetic field. This implies that you could not use a permanent magnet to do the attracting, and you would need an AC powered coil. Not sure what I think about this theory. Could be an interesting experiment.Comment
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More old than walk!
The old article was called "The Magnetic Print" or some by the style.
No only for gold, yes for non-ferrous metals.
Here the constructional article (similar to "The Magnetic Print"):
http://www.rexresearch.com/mrmagnet/mrmagnet.htmComment
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GOLD MAGNET
Maybe someone from this forum with the electronic expertice can build this from the above diagram and schematics and then report to us the results?Comment
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What incredible luck. I thought I would look for the original article for the AC magnet, and it was in the very first issue I picked up! (I have several hundred electronics mags.) It was Popular Electronics, Sept. 1962. Article was called "The Master Magnet," and is basically the same as the link Esteban provided. At some point, I'll scan the article to PDF and post it.
Same issue has "The Lodestar" metal detector project.
- CarlComment
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Yes
Gentlemen,
Years ago during the experimentation of a very high powered PI detector I was building (many amps > 10), I would dangle a target i.e. silver dollar over the coil with a string while watching the oscilloscope. While watching the scope, I felt something on the string. I looked to left to see the string at
a angle and the silver dollar stuck (weakly) to the coil.
Not especially surprized by this I did mention it to a friend who had seen on TV some show where a guy was going to mine the ocean floor with a "gold magnet". He thought the
show must be B.S. but now thought there might be something to it after all. He remember the guy said the ocean water helped with making the gold float a bit and would not work as well in air. He was only recovering very fine gold with this device.
Anyway, there is in fact, this possibility, , but will require a suitable power source. Have fun.Comment
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btw
Should add I was at about 2-5 khz, don't remember, but
higher then 60 Hz/50 Hz shown here. Now the phase shifts are not exactly 90 degrees and this "lag" can change with
frequency. anyway, if possible you may want to increase the frequency if you can do this and still have a strong power source. Now figuring out the right freq for what you are
doing is the homework assignment.
Have Fun.Comment
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Same issue has "The Lodestar" metal detector project.
- Carl
P.E. JUNE 1959 - TRANSISTORIZED BFO:Comment
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Non ferrous Magnet
Hi everyone,
It is possible to attracked non-ferrous metals. It works like a shaded pole motor. The core of the electro-magnet has ferrous and non-ferrous material.
By warping the magnetic field the eddy currents in the non ferrous target take on an opposit polarity as the magnet and therefore attract.
see this link for a interesting book on the subject.
Regards Mark S.
http://www.lindsaybks.com/bks2/elmag/index.htmlComment
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The post above by Mark S. regarding shaded pole motors triggered a dormant memory. I have an old book by the late Professor Eric Laithwaite called Propulsion Without Wheels (published in 1966 and costing 63 shillings) which discusses the linear induction motor in some detail. Chapter 10 deals exclusively with magnetic levitation. There is a superb photo of an aluminium sphere being levitated by a coil carrying an alternating electric current. The levitating coil arrangement can either consist of an inner and outer coil (with the inner coil carrying a current that lags in phase behind the outer coil) or one coil with the inner coil replaced by a copper tube. The latter case is the shaded-pole equivalent of the former. The two coil version looks very similar to the first design posted in this thread.
Prof. Laithwaite says that "whilst the main part of the sphere has lift forces, the lower central portion is actually attracted to the coil. [The photo] shows an aluminium sphere suspended in this way. This effect can be emphasized by means of a small piece of aluminium held just above the centre of the coil system when the sphere is removed. If the metal is attached to the arm of a balance it will be found to be attracted when the current is switched on. This attraction of conducting objects to a.c. magnets is opposite to what one might expect after performing jumping ring and levitation experiments.".
Interesting stuff...Comment
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