Howard Johnson Replication Tube Claim

[lostcauses10x]

It seems the pole shift back on the magnet as the domains deteriorate. Notice the lines going at the back center of the magnet. On the inside of the U the one strong side even tends to go completely around the expected pole. a most interesting thing going on there.

The most interesting point about the video showing the magnets effect on iron powder:
it appears that the left side of the magnet is much weaker the the right side.
If this is true then this is the first time I have witnessed a magnet with one pole weaker then the other.
It actually looks like a one poled magnet.
According to standard magnetic theory this shouldn't be possible. As far as I know anyway.
A strange shaped magnet could have the magnetic field on one side following a different path but not weaker then the other.
If I'm wrong about this please correct me with some kind of reference, I still have lots to learn. 

[Omnibus]

Question is, was it symmetric at the get go and then ran down due to the interactions w/ the rotor magnets or that's the way it is to begin with and that's why we see the desired full turns of the rotor, if at all?

[Grimer]

The most interesting point about the video showing the magnets effect on iron powder:
it appears that the left side of the magnet is much weaker the the right side.
If this is true then this is the first time I have witnessed a magnet with one pole weaker then the other.
It actually looks like a one poled magnet.
According to standard magnetic theory this shouldn't be possible. As far as I know anyway.
A strange shaped magnet could have the magnetic field on one side following a different path but not weaker then the other.
If I'm wrong about this please correct me with some kind of reference, I still have lots to learn. 

I'm glad someone else has spotted that. Here is a post I have just sent of to the Mylo Yahoo site a few minutes ago

==================================================
I'm beginning to wonder if its not so much a question of degaussing as
changing the pattern of magnetisation. Pushing the North pole to the
back of the horseshoe so that one effectively ends up with a bar magnet
with a dead north arm. This might explain some of the confusion over the
pattern of magnetisation of the stator.
==================================================

It's as though the horseshoe shape is an unstable state into which the field pattern has been forced and it wants to get back to the straight bar magnet pattern. Something a bit like the behaviour of those Nitinol and Terfenol-D alloys in fact.

I think we are definitely onto something there.

[Grimer]

@Grimer,

I think you should kick in there and straighten up that fellow @joshs about his error in understanding the recoverable energy stored in permanent magnets. @vibrator is trying to explain it to him carefully in various ways but @joshs just doesn’t get it. Demagnetization of a permanent magnet requires energy input, a PM isn’t an energy reservoir that can be discharged like a capacitor and do work, correct? Please tell him that in order to demagnetize a permanent magnet one needs either to bang it (repeatedly) on the floor, heat it up to its Curie point or apply a counter H equal to its coercive force. All this requires work to be done, that is, energy to be spent, correct? Also, a permanent magnet isn’t an electromagnet, which @joshs so much likes to liken it to. And even in the ideal case of a magnetic field created by current flowing in a superconductor, to demagnetize it one needs a back-H.

I fear Joshs' case is terminal. 

All we can do now is pray for the repose of his brain. May it rest in pieces. Amen

[ellubpt]

Very perceptive  . . she is a girl !
i tried to chase her away to take the pic
but something anew in her space .. she would have nothing of that !

Most are from this catalog .. Various tool companies in the US and Canada will carry them too.
i got mine from a tooling supply company in Ottawa Canada.
http://www.eclipse-magnetics.co.uk/

Thanks for the link to the magnet source.
Good luck with your replication efforts.
Say Hi to the cat for me.