Stubblefield coils (bifilar) and speculations

[jeanna]

Wow,
good call storre. [nevermind this remark]

@Bill,

I was thinking about the core too.

After my head stops spinning following the strawberries in my coil and thinking about the caduceus and on and on...

I remember that NS is always shown with 2 batteries a distance apart and except for the posed shot with his son in the room. Granted the 2 are to the N and S of a telephone device, but...

I also remember the time I was reading the voltage on a battery outside and saw that if I connected the cu to my carbon rods some distance apart from my NS coil the voltage would go up; and if I also connected the iron to another iron rod in the ground a distance away it again added to the voltage.

So, I am wondering if NS really did work with  0.7vdc or maybe he worked with a starting voltage of 1.4 vdc.

perhaps a reed switch or a spark gap on each of 2 coils at a distance and connected through the ground?

----

Do you have any reed switches?

All I have are NO

I think the other kind are pretty rare.

jeanna

[Pirate88179]

@ All:

Below quoted in bold, is from something I found on the history of insulated copper wire:


Titre du document / Document title
The early history of insulated copper wire
Auteur(s) / Author(s)
MILLS Allan A. (1) ;
Affiliation(s) du ou des auteurs / Author(s) Affiliation(s)
(1) Department of Physics and Astronomy, University of Leicester, Leicester LE1 7RH, ROYAUME-UNI
R?sum? / Abstract
In the early 1800s galvanometers could be constructed with the fine gauges of silk-covered copper or silver wires produced for decorative purposes, but when Faraday was making his classic electrical experiments in 1831 heneeded a sturdier gauge of copper wire. Bare copper wire was available in many diameters for mechanical applications, but coils for electromagnetic investigations had to be insulated with string and calico. It was soon realized that the cotton-covered springy iron wire then used to hold out the brims of ladies' bonnets showed how copper wire might be similarly wrapped to provide a flexible insulation. The simple manual machines used by the bonnet-wire makers were readily adapted and improved, and a six-head version was built by William Henley. This craftsman's vision of the growing importance of insulated copper wire was abundantly justified, and he built up a large-but poorly organised--empire in the wire and cable trade. Henley's original multiple-head wrapping machine has been located in the Science Museum, London, and the associated silk-covered copper wire subjected to physical, chemical, and electrical testing. For comparison, the electrical conductivity of the 'mechanical grade' copper wire used by Faraday has also been determined.
Revue / Journal Title
Annals of science   ISSN 0003-3790   CODEN ANNSA8
Source / Source
2004, vol. 61, no4, pp. 453-467 [15 page(s) (article)] (ref. et notes dissem.)


They first mention cotton, and then both cotton and silk.  Just passing it on.

@Storre:

Yes, I mean to the core itself. (Iron core)  I get easily 10 times more mA's readings and over twice the vdc readings from the core to the other wires.  The direction of flow should not change or be reversed so it should not negate the magnetic field.....right?  Or, am I wrong?  I am over my head here and do not pretend to "know".

Bill

[storre]

hi jeanna:

Maybe a way to increase the voltage is to just increase the quantity of cells like a car battery is made. We are basically dealing with 1 cell with a bifilar setup but if we use a 4 wire setup quafiler? (hehe) instead of 2 then we double the voltage right?

Just wire them in series to not null out the self-inductance?

You think that would work in case the electromagnet is not strong enough in the bifilar setup to open the reed switch? Well NS patent only calls for bifilar so it must not be necessary but it could be an easy way to boost the power on this electromagneticbattery thingy

[Pirate88179]

@ Jeanna:

Yes, we both have done similar experiments with our coils and carbon rods.  I am leaning toward using the core in the connection. (at least, trying it that way)

No, I have no reed switches NO or NC.  I do have some relays from my van I can take apart and make my own reed switch.  I believe I can make it either way, open or closed.

I am still searching for copper wire insulated with cotton with no extras added.  There has to be someplace in the world that makes this stuff.  Right now, I am leaning back to the stuff Joe posted. (tubes of cotton)  I am thinking that the audio shop does not make the stuff, we need to find where they buy it from.

Bill

[storre]

@bill

I think using the core would change the electromagnetic operation. It could be considered part of the voltaic couple since it's connected to the rest via the electrolyte but I think it would screw up the spinning action of the electromagnet.

I was trying to think what NS might have used as a sort of reed switch and drew this. What do you think? Starts off in the closed position due to gravity which then would turn on the magnetic field, raise the black metal contact (turning off the magnetic field) then it would return to it's normal closed position and start all over. Would just need to experiment with the weight of the moveable contact and the distance from the core. The distance could be regulated by moving the fixed pivot base up and down.