This other drawing here too, with two shielded magnets. The shielding can also be iron, how it is worse is that the edge is wider, and thus there may be more negative attraction. But depending on configuration, i don't know whether it's always true.

What can be an iron shielding, a hammer head? With a proper size and shape hammer maybe. Ah, this reminds me. The core laminations of an old transformer. These can also be easily cut.

Ok, does anyone try to find any theoretical problems with it? I see that there is negative attraction, because a shield attracts to another shield even when overlapped. But this must be much less than the force by which the shields attract from the sides, as this attraction is not shielded at all. In addition because the fixed magnet is tilted, its shield will be further away when the moving magnet moves on. This is the whole principle of shielding. And all that matters is more difference between the positive and negative attraction.

Ok, maybe i should explain too, what is on the drawing, as it may not be clear for everyone. The left magnet there is moving. It moves on a fixed trajectory in the direction of the arrow, like a train moves on the rails. This may be linear, or it may also be like on a large disk, so the movement is close to linear. When moving on the fixed track, all that matters are the components of the forces that are parallel to that track. That is every force is seen as two components, one parallel to the track, either in the direction of the arrow (positive direction), or in the direction opposing it (negative direction). The other component is at the 90 degrees angle from it, in case of a disk the "radial force", that does not affect the movement of the moving magnet at all. The right magnet is fixed in place, and doesn't move, it may be called a "stator".

My another thought is, when using a disk, it may be better to have two stators both working in a complete synchronicity. More than two stators likely doesn't give anything, bout further reducing the radial forces, but this is likely less important. Why, because when the attraction happens at the same time at the opposite sides, then the forces compensate each other, and there is less radial force to the bearing.

Any thoughts about the theory by anyone?

From my experience, my theory is similar to that of Howard Johnson
the shield doesn’t just “shield”, it diverts the magnetism through the metal.

Yes the shield doesn't block, it likely does that below. There the field lines that without shield did go up, now go to the side.

There will be found some small field effect outside, but imperceptible to most

Yes there are things that we know, but i don't exclude that there can also be things that we don't know. Because we don't know that much about fields and quantum. All the purpose of the research is to find out how it is.

Of course we badly need better and more precise instruments. No hope to measure all these subtle things otherwise, and find out all that happens. We cannot even measure the forces of the shield, how pathetic is that.

My spring scales have not yet arrived. They have 1 newton range, one division is approximately one gram, means that it should be at least possible to measure with the precision 1/4 gram, which may be for some purpose enough.

How the electronic scales and force gauges are made, they use a pressure sensitive resistor, it is that such resistor also reacts to bending a surface. The rest is a non-linear transform by microcontroller, translating the resistance into force. Possible to make such thing, and it's not expensive, but it's a whole separate task.

I cannot measure the strength of the force with compass.

I cannot measure the strength of the force with compass.

You can measure deflection
Which is proportional to field strength at a given distance

The strength of a magnetic field decreases with the square of the distance
If distance is the same, it requires a certain amount of force to deflect the needle
the degree of deflection is directly proportionate to the force, at that distance.
It is an arbitrary proportion, like the rubberband.
Unless you know the moment of inertia of the needle on the substrate.


If your goal is to measure the difference between one side of the field vs the other
This is the best and most accurate tool for the job.


With the disk set-up,
You are working with the leverage of the radius from the fulcrum (bearing)
this is not the same as the linear force.
You will get a measurement, but what are you measuring?




You can also make a vertical set-up, where-in the force measured is a function of
the time derivative of gravity. (stationary gravitational force) E= MGH


It doesn’t have to be direct vertical repulsion
You can use the lift or pull force of a known mass on a string
either wrapped around a shaft or using a pulley, or eye-ring

My spring scales arrived. This one is 1 Newton, can measure very weak forces. It did cost $2.85 from ebay. I also got another, 5 Newtons, i really wanted 10 Newtons or greater, but these were the cheapest ones i could get.