The Gabriel Device, possible COP=8

[the_big_m_in_ok]

@Mags
Did Tesla patent anything like that?  Wait.  He did have something that had a coil inside a toroid, I think.  At the very least, there are a few patents like the .PDF that was posted.
--Lee

As I said, he had a coil inside a toroid, thusly:  #433,702.  GOOGLE's "Advanced Patent Search"   and   http://www.pat2pdf.org   should allow you to download a copy if your computer has a .PDF compiler on its hard drive.
(This computer is filtered against copying text to the address bar at the top of the page.)

--Lee

[JouleSeeker]

Hey JS

Here is a link to the pat.
http://www.teslauniverse.com/nikola-tesla-patents-433,702-electrical-transformer

Here is an excerpt ...

1.A A is the main core of the transformer, composed of a ring of soft annealed and insulated or oxidized iron wire.
2.  Upon this core is wound the secondary circuit or coil B B.
3. This latter is then covered with a layer or layers of annealed and insulated iron wires C C, wound in a direction at right angles to said secondary coil.
4.  Over the whole is then wound the primary coil or wire D D. [snip]

Mags

Very interesting Mags, and I agree this is very much like the Gabriel design.
I find it clever to use IRON WIRE to form the toroidal core -- and also, to form the outside "donut" shell. 

I had an idea -- to pass a CURRENT (could be AC) through the IRON-wire core and shell, in order to VARY the magnetic properties of these (permeability, etc.) in REAL time.[/b]  Does Tesla mention such a possibility?
Anyway, I will definitely be reading the Tesla patent.
Thanks again,
Steven J

[Mavendex]

they make permalloy wire probably cheaper than sheets, mmmm take teslas idea and motivate it thru the 21st century don't use steel or iron to make the field but a better magnetic conductor.

Just a thought
Mav

[broli]

they make permalloy wire probably cheaper than sheets, mmmm take teslas idea and motivate it thru the 21st century don't use steel or iron to make the field but a better magnetic conductor.

Just a thought
Mav

That's actually a very interesting point. Just a simple search on alibaba gave numerous suppliers; http://tiny.cc/dj3j3

That would need no machining or much hard work to spin it around the secondary or some plastic shell covering the secondary.

[teslaalset]

That's actually a very interesting point. Just a simple search on alibaba gave numerous suppliers; http://tiny.cc/dj3j3

That would need no machining or much hard work to spin it around the secondary or some plastic shell covering the secondary.

Hi Broli,

Found another link you might be interested in that also mentions permalloy sheet:
http://www.espimetals.com/index.php/online-catalog/831-permalloy

I tried simulating the original Gabriel device in Ansys Maxwell, but it appears that too much input power is required to get the outer shell saturated in case of pure iron.
The example shells are simply too thick to work out a practical implementation.
Iron sheet would help out as well probably and is a bit cheaper than any permalloy material I guess.