Hello all!
During the hollidays I have been reading and experimenting.. :)
After getting my hands on the Joe Newman book, I tried out some of the ideas.
In one setup the tranformer coil I use, the temperature goes down about 2K in about five minutes running.
I would like to ask you all if this is common or rare?
I use no high voltage only around 12-24V
I have also running some tests with a 100 pound coil, It is really interesting!
Nowdays Joe Newman seem to work as a clown discrediting himself, the book is something different..
Thanks B-F
Please post photo or vid.. and schema
Leo48
Hi!
It is really simple setups, like Newman setups but no rotor with magnets.
Charging a very long coil and disconnecting before the charge reach the end and catching the bemf. Only i use very heavy coils and thick wire as Newman advice us to do.
I will draw some schematic as soon I clean up my computer from the 800 viruses I got as a christmas gift. :(
Has anyone had a cooling transformer in a setup? :o
Quote from: blind-fail on 2015.01.04, 17:24:28
Hi!
It is really simple setups, like Newman setups but no rotor with magnets.
Charging a very long coil and disconnecting before the charge reach the end and catching the bemf. Only i use very heavy coils and thick wire as Newman advice us to do.
I will draw some schematic as soon I clean up my computer from the 800 viruses I got as a christmas gift. :(
Has anyone had a cooling transformer in a setup? :o
You should have a look at Patrick Kelly's latest free energy pdf and look up Danield McFarland Cook.
Thanks I will do that O0
You should bear in mind that when cold electricity is generated, it can be as good as its word. Frosting has been noticed on the metalwork of motors.
(//)
Hi!
Trying to upload schematic, something is not working???
It worked after all, could not see my pic in preview.. :)
I have more power using heavy air core coil, 2-10 Ohms.
Cooling is present in all coils more or less.
Thanks B-F
Hi B-F
Well cooling has to be interesting, any chance of a video of it cooling during testing ???
Does it cool and then stabilize after a certain time or does it keep falling in temperature.
I don't think many would ever check the temperature so the effect may have gone unnoticed.
Cheers
Peter
Hi, I will be able to upload a video in a few days.
As a refrigeration guy, no strange temperatures will pass unnoticed ;)
Coils are cold after stopping the device, turns to room temperature after 10 minutes or so, depending of mass of course.
This discovery is very new for me, so more testing must be done.
Rgds B-F
(//)
On time for switch must be very short!
Next step is to rise battery voltage to around 2-400V DC, but that will be a little scary :o
The voltage kickback will be very high!
If you try this, keep a good safety distance!
Thanks B-F
Hi B-F
Sounds great, in the near future i maybe able to run some tests myself, still working on my nS pulser circuit, so when that's running i can put 100nS or less pulses into it and i have an infrared remote temperature thermometer so can check the temp from a distance away from switching noise.
A video would be great if you can manage one just for prosperity, it's a great way to record things and really tells everyone exactly whats going on, you know the saying seeing with your own eyes etc 8)
You will have the first video that i know of that shows a temp drop, although i have not checked to be sure but not seen any evidence in my travels, so will be really interesting to see for sure O0
Cheers
Peter
Very Nice! O0
When running a coil with to low resistance ( around 0.5 Ohms ) the cables connecting the coil is jumping up and down, funny to look at, I will try to film that also!
Thanks B-F
Quotethe cables connecting the coil is jumping up and down
Yep that sounds interesting also, so the mag field around the current carrying wire is tugging on a magnetic field probably from the decaying field in the core maybe, i would imagine the earths field is too weak for that.
To have a large current and then have the coil go cold does sound interesting regarding I^2 R Losses which should heat the coil up.
How long before you can build a new type of fridge >:-)
Cheers
Peter
Using my previous nS pulsers i have put amps in a short piece of wire but because the time is so short the average current is low at 3mA even at 50V
Quote from: Peterae on 2015.01.05, 20:16:32
Yep that sounds interesting also, so the mag field around the current carrying wire is tugging on a magnetic field probably from the decaying field in the core maybe, i would imagine the earths field is too weak for that.
To have a large current and then have the coil go cold does sound interesting regarding I^2 R Losses which should heat the coil up.
How long before you can build a new type of fridge >:-)
Cheers
Peter
Using my previous nS pulsers i have put amps in a short piece of wire but because the time is so short the average current is low at 3mA even at 50V
That is very fast pulsing!
My idea is to focus mostly on a very rapid fall time, rise time not so critical..
What do you think?
Thanks B-F
It would be interesting to devise a way to control or slow rise and fall independently and then it could be proven if you are right about the fall only being important, not sure how that could be achieved yet, maybe a diode and a cap in series, change the direction of the diode to slow either rise or fall, don't know how it would work out, need to think on it.
A quick search found an interesting circuit
http://www.datasheetarchive.com/dl/Datasheet-03/DSA0042721.pdf
A quick question to Paul R
This "frost on the motor",do you have any Links?
thx
Chet
I just had an email from a friend and he gave me this link to post, no had time to read it yet, off to work ;)
http://en.wikipedia.org/wiki/Magnetic_refrigeration
Quote from: Peterae on 2015.01.06, 06:38:15
I just had an email from a friend and he gave me this link to post, no had time to read it yet, off to work ;)
http://en.wikipedia.org/wiki/Magnetic_refrigeration
Interesting indeed..
Less energy in coil - coil cools down!
Where goes this energy? Voltage rise in the kickback? Coil is reheated by ambient heat for the next cycle!?
One of my coils will spend a few hours in the freezer to see if the voltage kickback becomes less O0
Thanks B-F
BF - how do you measure the temperature? what device and readings do you get?
QuoteHi, I will be able to upload a video in a few days.
As a refrigeration guy, no strange temperatures will pass unnoticed Wink
Coils are cold after stopping the device, turns to room temperature after 10 minutes or so, depending of mass of course.
From wiki:
QuoteThe magnetocaloric effect (MCE, from magnet and calorie) is a magneto-thermodynamic phenomenon in which a temperature change of a suitable material is caused by exposing the material to a changing magnetic field. This is also known by low temperature physicists as adiabatic demagnetization. In that part of the refrigeration process, a decrease in the strength of an externally applied magnetic field allows the magnetic domains of a magnetocaloric material to become disoriented from the magnetic field by the agitating action of the thermal energy (phonons) present in the material. If the material is isolated so that no energy is allowed to (re)migrate into the material during this time, (i.e., an adiabatic process) the temperature drops as the domains absorb the thermal energy to perform their reorientation. The randomization of the domains occurs in a similar fashion to the randomization at the curie temperature of a ferromagnetic material, except that magnetic dipoles overcome a decreasing external magnetic field while energy remains constant, instead of magnetic domains being disrupted from internal ferromagnetism as energy is added.
One of the most notable examples of the magnetocaloric effect is in the chemical element gadolinium and some of its alloys. Gadolinium's temperature increases when it enters certain magnetic fields. When it leaves the magnetic field, the temperature drops. The effect is considerably stronger for the gadolinium alloy Gd
5Si
2Ge
2).[3]
Praseodymium alloyed with nickel (PrNi5) has such a strong magnetocaloric effect that it has allowed scientists to approach to within one milliKelvin, one thousandth of a degree of absolute zero.[4]
Quote from: Chet K on 2015.01.05, 22:07:51
A quick question to Paul R
This "frost on the motor",do you have any Links?
thx
Chet
I'll have a rummage around. I saw the effect at the UK Free energy conference in '07, maybe '08. There was a demonstration involving hydroxy gas generation and electrical output which was fed into motor. The white frost formed on the casing in the general area of the input terminals. To be honest, I was more taken with the gas which had turned the electrolyte milky white in a strange way.
Hi Steven!
I measure with IR gun..(//)
Hi,
about temperature drop I have measured:
around 2 deg K, Kelvin is the same as Celsius but Kelvin use absolute zero as 0K and Celsius uses 0C as water freezing temp. This Fahrenheit thing only confuses me O0
Celsius is wonderful freeze point 0 deg and boiling point 100 deg (water) :)
I have only been running this for short intervals ( 5 min), it is not so silent running since it is electromechanical for testing.
Rgds B-F
BF
So to be clear [so I understand !:"]
you are causing a battery short circuit into a BIG coil [at 5 Hertz pulse] and seeing a chill effect instead of the expected Temp rise?
?
is this correct ?
thx
Chet
That is correct! O0
Voltage reverse kick is many times the battery voltage, I know that could be of normal magnitude, but it can light up more than led's..
When battery voltage is adjusted the power input goes very low. I can light up 50V led's from a one volt AA battery, not to full brightness but still more than I ever could hope for :o
Rgds B-F
BF
The coils are quite Big? so the loss to ambient most be Big Too ...
have you done any calorimetry or sealed the coils inside a very well insulated box in a heated room
after an overnight "Temp stabilization".
this would be interesting to see.
thx
Chet
QuoteVoltage reverse kick is many times the battery voltage, I know that could be of normal magnitude, but it can light up more than led's..
When battery voltage is adjusted the power input goes very low. I can light up 50V led's from a one volt AA battery, not to full brightness but still more than I ever could hope for Shocked
Its called flyback voltage - and many of us have played with this. I have a 120-V LED bulb I easily light up with flyback voltage from a simple coil, using one AAA battery... I do this routinely, its fun to show.
But - So what?
A transformer can produce higher output voltage than input V also.
This is NOT overunity! that is, the power out is still less than the power in...
OR are you claiming more POWER out than power in?
Perhaps this isn't a case where the term, "overunity" can be applied. Rather, it may be an example of how conventional electricity can be used in a properly configured system to draw cold electricity into said system.
Bob
Quote from: PhysicsProf on 2015.01.09, 18:41:34
Its called flyback voltage - and many of us have played with this. I have a 120-V LED bulb I easily light up with flyback voltage from a simple coil, using one AAA battery... I do this routinely, its fun to show.
But - So what?
A transformer can produce higher output voltage than input V also.
This is NOT overunity! that is, the power out is still less than the power in...
OR are you claiming more POWER out than power in?
Hi!
The only claim I have so far is that the coil/transformer is getting colder/ loosing heat! Since energy can not be destroyed, where does it go? Can we learn how to
catch it?
The effect is more obvious when running low resistance coils.
I started up a solid state version today / 10 Hz or so.
So my question is (related to topic), Is the cooling event possible overunity (heat to electricity conversion)?
Thanks B-F
Quote from: Chet K on 2015.01.09, 14:54:56
BF
The coils are quite Big? so the loss to ambient most be Big Too ...
have you done any calorimetry or sealed the coils inside a very well insulated box in a heated room
after an overnight "Temp stabilization".
this would be interesting to see.
thx
Chet
Working on it! O0
Quote from: Bob Smith on 2015.01.10, 16:32:18
Perhaps this isn't a case where the term, "overunity" can be applied. Rather, it may be an example of how conventional electricity can be used in a properly configured system to draw cold electricity into said system.
Bob
Hello and welcome O0
This could very much be the case?..
Rgds B-F
BF
It would truly be amazing to see the temp drop in this scenario.
2 degrees is a huge amount to play with in a sealed caloric chamber.
Very exciting indeed.
Thx
Chet
Hi!
Solid state setup does not work, no or very little cooling...
Rgds B-F
Quote from: blind-fail on 2015.01.05, 19:21:41
(//)
On time for switch must be very short!
Next step is to rise battery voltage to around 2-400V DC, but that will be a little scary :o
The voltage kickback will be very high!
If you try this, keep a good safety distance!
Thanks B-F
BF
Is it fair to say that your switching device effectively makes this an open system (with opening and closing diploe)?
I just watched a video in which the cap played a crucial role in charge output from an open system, and thought of your setup. The vid was in Spanish, and I posted what I thought were some key points about its apparatus. Here's the link:
http://overunity.com/13721/energy-from-the-ground-self-powered-generator-by-barbosa-and-leal/msg436649/#msg436649
Although different setups, do you see anything they might have in common in their charge output?
Bob
Quote from: Kator01 on 2017.10.02, 20:11:29
Hello all,
While I was reading a paper from the Greek scientist Papimi which is only accessible in the web-archive
I found a description of an engery comparison in an arcing device here:
http://web.archive.org/web/20110820094309/http://www.papimi.gr/university.htm (http://web.archive.org/web/20110820094309/http://www.papimi.gr/university.htm)
At the end of the page he referred to Dragones work. So in researching the web for Leon Dragones work I found the following very interesting paper :
http://exvacuo.free.fr/div/Sciences/Dossiers/EM/Leon%20Dragone%20-%20Energetics%20of%20Ferromagnetism.pdf (http://exvacuo.free.fr/div/Sciences/Dossiers/EM/Leon%20Dragone%20-%20Energetics%20of%20Ferromagnetism.pdf)
Regards
Mike
Do not open the second link as it has a virus, my system shut it out thank goodness
Regards
Mike 8)
centraflow
Thanks
I have a computer which I use for these things and would gladly make a copy paste post here for the topic [transfer the Info]
but it seems the PDF is not allowing it ,a copy image window comes up it seems to allow a "copy" but it doesn't allow me to paste it [for posting here]
it is a very interesting PDF
will look into it some more, maybe later one of the members can "Skype share page" with me to see how we can get it on here
I always Luv Kator's contributions [as do many others]
No problem here to open that link, my Gdata antivirus does not find anything, so i have copied it and attached below.
(I ran extra checks using malwarebytes and SuperAntiSpyware too).
Itsu
Quote from: Itsu on 2017.10.03, 13:50:17
No problem here to open that link, my Gdata antivirus does not find anything, so i have copied it and attached below.
(I ran extra checks using malwarebytes and SuperAntiSpyware too).
Itsu
Your copy is ok O0 but the other link still gives me a warning for some reason :-\
Thanks
Mike 8)
Kator
quote
Personally I do not have the means to do such an experiment but I thought it might be of interest.
end quote
I have arranged a discussion with Stefan for the end of this month ,the purpose being to solve this issue [funding ,equipment etc etc
for open source projects
for fellows like yourself !! and others ...............
I am amazed at the resources that can come to the right group [a group which has good history doing service already]
if we build it they will come.......a 100% transparent [for every penny accounted for to the cause not the bookkeeper]
a group that helps those who can't [experiment] help those who can experiment
the resources are stupefying out there ,I am already seeing this.....potential
I am doing a quick replication of the circuit presented on page 1 of this thread, see picture 1
The setup as used can be seen in picture 2
I started with a switch, but this is very tiresome to do, so i replaced it with a MOSFET driven by my FG.
There are some unknowns like the used capacitor and the transformer resistances etc.
Up till now i was not able to notice any cooling effect, but there hardly is any Bemf seen which in my mind could/should be the reason for any cooling effect.
I will keep on trying different caps, frequencies and duty cycles.
Perhaps i need to go to 24V or higher.
Video here: https://www.youtube.com/watch?v=Yr4q1qh---Q (watch with chrome or Firefox as in IE its crap)
Itsu
@itsu
When I looked at the schematic you posted I was happy to think that finally a switch was on the positive side of the battery but noticed in your video that you then indicated the polarities deployed so you are pulsing the negative side.
For me real Flyback occurs only when the positive is being pulsed. Flyforward occurs only when you pulse the negative side of the battery. This because our diodes only hold back the positive. We never invented the negative diode or it is hidden from open use. So if you really want to play with diodes, some should consider pulsing the positive side. So what. A PNP instead of an NPN. Or if you use a H-Bridge, you will get half positive half negative flyback for free from the Earth rebias.
So at best the flyforward as you have it will occur at negative pulse ON creates a forward conveyance of the negative bias to reverse the positive bias already in and up to the first half of the primary but the diode on the positive to the bulb is killing any chance of that backward conveyance to get to the bulb. Maybe try there a 10-12 volts zenor diode. This way anything above will convey and light the bulb.
Then at pulse OFF, the positive bias reclaims the negative half of the primary conveys back that negative so this may light up the bulb again but now with negative higher voltage. The bulb should not care about positive or negative as long as it sees a bias difference on each side. It's always hard to explain for me because I see these little experiments in a totally different way.
wattsup
I will reach out for Blind fail [he is an old friend]
to see if he will help with this.
Wattsup,
i too thought that the positive was on the upper / switch side, and i had it connected at first that way, but nothing happened then.
So then i noticed the battery symbol which normally has the positive side on the wider bar, so at the bottom here.
This gave some results as can be seen in the video, allthough the bulbs never light up, but then again, i don't know if they should.
I think i need a bigger back EMF pulse (bigger transformer?) to have some effect, or perhaps the secondary transformer winding together with the cap should be in resonance.
I can try to swap the battery leads again and reverse the diodes, but i prefere to have those unknowns solved first.
Chet, thanks for your offer, it would be great to have some insight into this.
Itsu
@itsu
Hahaha.
I had prepared my original post as if the positive was being pulsed which has its own set of problems under that schematic. Then when I noticed your +/- on your video I changed it over to make if more relevant.
But, if the positive was pulsed, the same general problem is the primary of your transformer is probably just shorting out the battery to zero volts at each pulse leaving nothing for the bulbs. For now just try other primaries or even secondaries with more turns. Or, what frequency range can you pulse since you may have to go higher if the primary inductance is so low.
Also if the positive was on the switch side you would still need a zenor diode from the bulb pointing to the feed. The zenor will keep out power from the feed to the bulb up to a certain voltage making it available only to the primary and anything above that will drain to the bulb during flyback, pulse off.
This little circuit is good because it also helps show how if you consider electricity as flowing in one direction, it should never work. it should also show how we reinforce the electron travel model by saying that flyback is an outside field that miraculously jumps back into the coil to produce that peak voltage at pulse off. Since the electrons in one direction cannot do it on their own they needed to add the field collapse construct so EEers would have something to grasp onto regardless of the logic base going against it.
OK, let's say you just took a transformer and just shorted the thick primary leads directly onto the battery. Nine out of ten times the primary will eventually blow near the center winds. Rarely will it blow near the end turns. Why? Why should it blow anywhere if electricity is traveling in one direction then the stresses should be equal and dispersed throughout the primary? That never makes sense. But if DC feeds are actually both feeding both polarities into the circuit, meeting at coil center as the war of potentials fights it out while they get hot then it is our unconscious use of the diode that relegates and enforces the directional thought process of our present electrical concepts. Especially when our diodes only stop the positive from conveying back into the positive feed. We created our own play pen with the fences already set up to keep us in limbo. So where is the negative diode? None around. Why can you make a positive diode and not a negative diode? No answer ever given.
So if our electricity travels as electrons in a wire, why should the electron care about polarity while it is traveling in the wire? How are positive electrons and negative electrons possible when all they are doing is traveling in a wire? hahaha Basic EE is in trouble. Yes our systems work but we still don't know why at the atomic level.
But if you stop and consider that the battery voltage has two polarities that feed, but more appropriately convey, I'll say "forward" for simplicity, into the circuit up to the central point of the circuit which in this instance is either the center of the bulbs and the center of the primary, since both are in parallel, then look at how the diode holds back only the positive conveying forward, you will see that;
1) if the negative is pulsed, the two diodes on the positive of the bulb are useless other then acting like resistors. The bottom diode between the positive line and the bulb should be a zenor type rated at the applied voltage or slightly less.
2) if the positive is being pulsed under that same circuit, there should still be a top zenor diode required between the feed and the bulb.
OK, if you removed the transformer can your pulse light up the bulbs? If not take one bulb off and try again. Can it light up that one bulb? That would be another place to start as well.
wattsup
wattsup
Nice comment, and i agree with this: "Yes our systems work but we still don't know why at the atomic level."
So therefor people like us, who are trying to find some effect for the benefit of mankind.
Anyway, the primary measures 40 Ohm and 2.8H @ 1Khz (3.4H @ 100Hz), so the current at 12V is only 300mA.
The secondary measures 0.5 Ohm and 1.6mH @ 1Khz (17.5mH @ 100Hz).
As this suppose to work with "any switching device" including a button switch i guess the frequency for the cooling effect to show up should be around 5Hz.
When i remove the transformer, nothing happens as the upper diode blocks the voltage to the bulbs.
Itsu
I used a 40uF motor run cap parallel to the secondary and cranked up the frequency to show resonance using my current probe in the secondary LC circuit.
I cannot use my voltage probe (ground) as it would short out the FG ground lead.
At 920Hz we are in resonance on the secondary, but no cooling effect seen.
Screenshot shows:
yellow the drain / source voltage on the MOSFET
green the current through the secondary LC circuit (0.5A/Div.)
Itsu
itsu
I missed him this AM and now its too late [crazy busy day today in FE world]
I'll ring him tomorrow
Im not sure about transformers cooling down,but i have seen something odd on many occasions.
Quite often,when using a small gauge wire to run a large motor under load,i have noticed that the wire from the positive of the battery-to the motor gets very hot,while the same size wire going from the motor to the negative of the battery remains cold ???
How can this be when the same amount of current is flowing through both wire's,which are of the same size/gauge ?.
Brad
Good question Brad, i don't know.
I did find my Bemf pulse, its being absorbed, redirected, or whatever throught the bulbs and diode.
When i remove the bulb / diode branch, then i got this nice Bemf spike on MOSFET closure time, see screenshot.
Yellow is the drain voltage,
green is the drain current (50mA/Div.).
So somehow this absorbed, redirected or whatever Bemf pulse should/could be responsable for the cooling, i think.
But up till now i did not find any prove of a cooling effect.
Itsu
** NOTE
I see Peter moved the Posts !!
will give him a quick Note [Which posts]
OK so here will be the 3 Posts to start the topic from KatorO1
and I will remove this post after its Up [or Peter can]
Chet
Kator01,
sorry for any inconvenience, you can stay on this thread if you like as, as you also said, i don't think i will find any cooling effect with this setup.
But Leon Dragones work deserves a thread on its own i think.
I have pulsed my transformer setup in many ways by now and did not see any cooling effect, so hopefully BF can suggest something to try, thanks Chet.
Itsu
Hi Itsu,
If you want to start a new thread for a topic you just go to the board that is appropriate and click on the small blue box at the upper right just above the board title. The box says "New Topic". If you want it to be in this board the board title is "Heat to Electrical Power Conversion". When I make a reply to a post after I have posted, my browser automatically takes me to the board I added the post to so that makes it easy to add a new thread topic to that board.
Carroll
@itsu
Based on your post a screen shot here;
http://www.overunityresearch.com/index.php?topic=2736.msg65118#msg65118
You say resonance but that cannot be at 920Hz. I think your pulse width is way to wide. Looks like about 80%. Try it at 20% because that is the approx width of the first current rising slope going from zero to peak. Then at 20% find the real resonance point that should be way higher.
Also try an find a zenor diode because you are showing go voltage rise but it is not getting to the bulb. That diode is blocking it so the only way now is to overcome the diodes reverse threshold to light up that bulb.
wattsup
Carroll,
thanks for the comment, but i know how to open a new thread, i think Kator01 might want to open a new one on Leon Dragones work.
Wattsup,
not sure why you say that that resonance cannot be at 920Hz, if i calculate the resonance frequency (http://www.1728.org/resfreq.htm) of my 40uF cap and my 1.6mH secondary i get 629Hz.
I guess why i get resonance somewhat higher (920Hz) is because of the leakage inductance of the iron core transformer.
The duty cycle of the pulse was 20%, not 80% (we have a downward pulse from 12v to zero), but i tried both and all inbetween.
About the lightning up of the bulbs, i do not know that is even needed or wanted.
I do know now that without the bulb / diode branch in the circuit i do have a nice 200V bemf spike, so its being absorbed / redirected through this bulb / diode branch.
Itsu
Here the same situation as in the above screenshot, but now with the bulbs / diode again connected.
(mind you i run the MOSFET at 3Hz, 20% duty cycle, secondary cap is 230nF)
Instead of the 200V spike at MOSFET closure time we see no spike at all (yellow trace of the drain), see screenshot below.
Measuring the current through the bulb / diode branch (see green trace, 100mA/Div.) shows a peak current at MOSFET closure time (the redirected spike)
of about 133mA, so this will hardly light up a LED let alone an automotive bulb.
So i don't think the bulbs will light up any time soon in this setup.
EDIT: i changed the 2x series automotive 12V bulbs for a single power led (3V / 3W) and this one nicely blinks at 3Hz when the MOSFET closes.
Itsu
itsu,
no problem, it was just my ignorance about how to open a new topic.
Thanks CITFTA
Mike
The last days i have used countless configurations with and without a MOSFET switch and many different capacitors, both value wise as make-up wise including bipolar electrolytic caps
using both resonance as low and high frequencies and duty cycles.
Never did i notice any temperature deviation other then the normal room temperature change and/or slight heating up due to current (300mA) through the primary.
Unless new information arises, i will terminate this replication with the notion that a temperature drop with this setup was not detected.
Regards Itsu
well
your an amazing fellow indeed
I am still reaching out for the claimant ...his phone just goes to "the person you are trying to call cannot be reached at this time "
never an option for leaving a message ?? [sort of like Groundloops phone over there......wish we knew how he is doing too.....
your decision is of course a good one .
with much gratitude and respect
Chet
Here some reading related to the topic.
As far as I understand, if you want see some core cooling, you have to demagnetize core very fast.
With "normal" core material temperature difference will be about 1 degree or even less (not so easy detect).
Thanks Chet, thanks Vasik,
i will take a look at the PDF, it might reveal some extra info.
Itsu