Synchro1, I am not pretending anything, just sharing information with you.  I can't comment on your "out of the blue" comment about scrapyard electromagnets except to say that scrapyard electromagnets will behave exactly the same way as an electromagnet on your bench.

To be helpful, I did a search on "ampere turn" for you.   This is from one of the first few links:

<<<<<<<<<<<<<<<<
It has been found that an electric current sets up a magnetic field
 similar to that produced by a permanent magnet. This action is known as
 Electromagnetism and is very important in many devices. A desirable
 feature of electromagnetism is that it is possible to control the strength
 and polarity of the magnetic field. When current exists in a coil, the coil
 has all the magnetic qualities of a permanent magnet and is called an
 Electromagnet. If this electromagnet is brought near a permanent
 magnet or another electromagnet, the like and unlike poles react exactly
 as explained for the permanent magnets. Moreover, an increase of current
 in the coil increases the strength of the magnetic field, and a decrease
 of current weakens the field.
 
 Ampere-Turns:
 
 When the number of loops or turns of the coil is increased and the
 current remains the same, the strength of the magnetic field increases.
 Each loop or turn of the coil sets up it's own magnetic field, which unites
 with the fields of the other loops to produce the field around the entire
 coil. The more loops, the more magnetic fields unite and reinforce each other
 and, as a result, the total magnetic field becomes stronger.
 
 To compare the magnetic strength of different coils, and to obtain
 a basis for measuring the magnetomotive force of an electromagnet, the number
 of turns of wire is multiplied by the number of amperes of current carried
 by the wire and the result is called Ampere-Turns (NI). The ampere-turn
 is the unit for measuring the magnetomotive force of a current-carrying
 coil. In a formula, the magnetomotive force in ampere-turns can be expressed
 as:
 F = NI
 F = magnetomotive force in ampere-turns
 N = number of turns
 I = current in amperes
 For example:
 A coil with 10 turns and a current of 10 amperes has an F of 100
 ampere-turns.
 
 The above excerpted from: http://ourworld.compuserve.com/homepages/boyce_smith/magnets.htm
 
 Ampere-turns per meter is just as it reads, the number of ampere turns per length of the electromagnetic coil.
 >>>>>>>>>>>>>>>>>>>>>>>>>

Now, armed with that information, can you state what the mistake is in the clip that you linked to?

MileHigh

View this as a concept:

Hi Conrad, you are wrong with your conclussions and measurments, we need technology to make a prediction of the results,please not confuse more to the people, i will make an analisis of the pancake coil in the best laboratory in the world very soon...! saludos jorge.

@jorge: please tell us the input power (Volt and Ampere) to your drive circuit as shown in your video http://www.youtube.com/watch?v=VP-k-AW-ejM

Your pancake coils are very interesting, but one should compare input (to your drive circuit moving the rotor) and output (from your pancake coils).

In case you plan to publish test results from the "best laboratory in the world" please take care to show input power and output power.

I am not confusing the people, I am asking very straight forward questions.

Greetings, Conrad

Skycollection, you must try something with your first video, the lonely maget replaced by a coil who can spin must be a good way.

We can see in your video that you are a little less energy at the end, well if the energy calculated is the input.

A simple experiment to see the power of bifi coils...
Thanks for sharing!


Regards
Cc

@MileHigh,
 
            Why don't you perform the experiment to expose it as fake? You're the "Gadfly" in the face of basic fundamentals practically everyone else already learned about. 
 
              The coil increases the field strength without the increased current draw as you infer, or no one would have any use for the coil design. How do you explain it's broad industrial application as an electromagnet. if there's no advantage to it?
 
This is a quote:
 

                 "Bifilar windings are used at metal scrap yards as electromagnets since they do more work per kwh".
 
You infer that the bifilar coil would draw twice the current as the single wrap coil of equal Ohms, if both coils were shorted accross input electrodes! Explain how the bifilar coil magicly doubles it's resistance to consume twice the current? You're saying one of those nail core coils has twice the resistance as the other with the same wire length. Think about it!
 
The increased magnetc field is a result of Lorentz effect quanta mechanics, not the result of higher current draw.
 
Go ahead and do the 10 minute experiment! Get a second "D" cell battery. Connect them in parallel untill the voltage levels off. Hook them up to the coils holding the paper clips, then measure and compare voltages. It won't take long for twice the watt consumption to register a voltage differential between the batteries if your purblind theory's correct.

Synchro1 and Crazycut06:

You know the old cliche, you have to be very careful about what you read on the Internet.

The "Tesla bifilar electromagnet" stuff is bogus.  Have either of you done the experiment?  There is no reason that it should work.

I explained that the strength of a magnetic field for an electromagnet is determined by the ampere-turns.  In that document you can see that both wire configurations around the nail will give you the same number of ampere-turns.  Therefore both electromagnets will have the same strength.

Here is a big clue about the quality of the web site:

The magnetic field is not produced by voltage, the magnetic field is produced by current.  It's a subtle difference but it is still significant.  If the guy or girl that put up that web page really knew what they are talking about they would not have made that mistake.  Likewise, there is no "production of energy" associated with this, it's completely wrong to state that.  They use the term "efficient" without qualifying it so it is meaningless.  They are just using Tesla's name to make some money.

Because of this you should be very wary of that web site.  To me it looks like a junk web site created in the year 2000.  It just sits there to get some hits so that it can generate a bit of advertising revenue when people click through the ads.

If you don't believe me about the "Tesla bifilar windings" for an electromagnet, by all means do some testing yourself.  You will quickly come to the conclusion that it doesn't matter if the wiring is "bifilar,"  the only thing that counts is the ampere-turns.

If you don't believe me and won't be doing the tests, then please explain why a "Tesla bifilar winding" to make an electromagnet is better than ordinary winding.  After all, when you think about it there is no real difference between the windings.  The "bifilar" business is the same deal as the graphic that Synchro1 posted for the "bifilar" coil.  It's just an interleaved wiring of the coil, it's not truly bifilar.

The real point is that it's important to consider all the information coming at you and look at it in a logical fashion and evaluate it on a case-by-case basis.  There is a lot of junk information out there no matter what you are researching.  So you want to try to separate out the good information from the junk information.

MileHigh

Hi MileHigh,
I cannot despute you on this as i don't have enough experience with this bifi coil, i'll look for a video that i saw where he used a single turn coil versus a mutifilar one.
Thanks for the brief warning...
Regards
Cc