PhysicsProf Steven E. Jones circuit shows 8x overunity ?

[JouleSeeker]

  Yesterday and today, I have performed a simple experiment described below, and I wonder if others have tried this.  This link was given on the Romero thread (which I have not read all of-- getting long!).
In our discussion above, a critical element is the bifilar-wound coil -- and the experiment below is related:

[ http://www.tesla-coil-builder.com/bifilar_electromagnet.htm ]
Things you'll need:
2 - 16 penny nails  [I used 2- 10 penny nails]
about 3 feet of magnet wire - (20 to 28 gage)
1 - D Cell battery

4 - Paper Clips
Wind the first nail with 100 turns of magnet wire.  Leave about 3 inches of wire on both ends of the winding.

Wind the second nail with 100 turns of magnet wire, but in the following way.  Cut two equal length wires about 12" long each.  Holding the two wires together, begin turning 50 parallel turns of magnet wire around the nail.  When you have finished winding the coil trim off the excess wire so that there are 3" of wire on both ends of the coil.  Take the two inside leads from each end and twist them together.  Remember to clean the ends of the magnet wire so they can make an electrical connection.
This is what they should look like: (click on the image for a closer view)
[attached]

Two Electromagnets
Now connect the battery to the end leads of the single wound nail.  This will energize the coil and cause the nail to become magnetic.  Now pick up as many paper clips with the nail as you can.

OK, connect the battery to the ends of the bifilar wound coil.  Now pick up as many paper clips as you can with this electromagnet.

The same amount of voltage, from the same battery, produces twice as much energy in the bifilar wound coil as in the single wound coil.  This is just one of the many techniques Nikola Tesla used to make his inventions highly efficient.

  My windings on two 10-penny nails had a total of 40 windings on each, once a simple winding and once bifilar, as he describes the experiment above.
  I checked that the currents were close to the same, using a power supply with digital read-out.

   My results --
1.  Simple coil picked up 4 small paper clips; and separate expt, 3 small steel screws.
2.  BIFILAR coil picked up 5 small paper clips; and separate expt, 4 small steel screws.

Same D-cell battery...

  I like experiments that work, and this was straightforward.
Now --
1.  Why does the bifilar-wound coil pick up more than the simple-winding?
Both have the same power source, the same total number of windings, essentially the same current...  should have the same B field... I think.
But that is not the case, experimentally.

2.  Can we quantify this?  using a hall-probe, for example, to actually measure the two B fields so we can compare them Quantitatively.  The author wrote

produces twice as much energy in the bifilar wound coil as in the single wound coil

I think we can do a little better in quantifying the result, in terms of measured strength of B fields in the two cases.  But his write-up is  a good start!

3.  Has any one seen this result discussed as to WHY there is a difference?  or better yet, a publication in a journal on this subject??

   As always, I'd appreciate comments on this experimental result and these questions.

[nul-points]

[...]
3.  Has any one seen this result discussed as to WHY there is a difference?  or better yet, a publication in a journal on this subject??

As always, I'd appreciate comments on this experimental result and these questions.

you'll find some better quantified results here, Steven:

  link--> http://home.comcast.net/~onichelson/VOLTGN.pdf


hope this helps
np

http://docsfreelunch.blogspot.com

[Pirate88179]

Dr. Jones:

Remember that the original JT circuit was bifilar and so was the Stubblefield coil.  I have wound a number of both of them and I can say that they did it that way for a reason.  I do not know that reason but, since Stubblefield was a sort of buddy with Tesla, who also used bifilar windings, that tells me there is something to it.

I also think it is possible to wind 2 bifilar windings on a single toroid on opposite sides of the toroid.  I have not as of yet done this but plan on it in the near future.  The Jeanna circuit uses 3 windings on a single toroid but none are bifilar but this grew out of the MK1 windings in the JT topic.  I am going back to bifilar because I believe it gives some unique properties that can not be achieved any other way.

Bill

[neptune]

@Jouleseeker . I too tried the bifilar electromagnet experiments a couple of days ago , see the Muller thread . The nail pickup tests are crude to say the least , and results vary from one experiment to the next .What I can definitely say , is that bifilar ALWAYS picks up more nails , varying between say 25% extra , and up to 3 times as many . I found that a quadrifilar wound coil was better than a normal wind , but not better than a bifilar . If you get time , please try a quadfilar . It is hard to see how a difference in the capacitance or inductance of the wind would have an effect on a DC circuit , and we have been told that field strength is proportional to Amp-turns . Somewhere , I read a theory that with less inductance , The "rise time" of the field was quicker , more like hitting the core with a hammer than a gradual push , resulting in a stronger field .What do you think ?

[xee2]

1.  Why does the bifilar-wound coil pick up more than the simple-winding?

It has more inductance. Thus stronger magnetic field for same amount of current.