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RE: Wire Length (fwd)
Original poster: "Anthony R. Mollner" <penny831@xxxxxxxxxxxxx>
Jeez, it's beautiful, nice job.
From: Tesla list [mailto:tesla@xxxxxxxxxx]
Sent: Friday, December 29, 2006 10:22 PM
Subject: Re: Wire Length (fwd)
Original poster: "Barton B. Anderson" <bartb@xxxxxxxxxxxxxxxx>
Thanks Gary, appreciate the references you give out. I can understand
why Tesla increased the inner spacing. Hope I won't have to do the
same, but easy enough if I do. I finished the form today, so now just
a matter of installing the plexi standoff runners (which is inset
into the provided grooves). Then it should be ready for wire!
Here's a photo of the form.
http://www.classictesla.com/flat/Img_3002fast.jpg (dial up)
http://www.classictesla.com/flat/Img_3002.jpg (original image, large file)
Tesla list wrote:
>Original poster: "Gary Peterson" <g.peterson@xxxxxxxxxxxx>
>>From: Barton B. Anderson <bartb@xxxxxxxxxxxxxxxx>
>>. . . There are many ways to implement the primary
>>(outer edge or anywhere below the primary). Thus,
>>high coupling can be achieved with a "much" larger
>>airgap than used on a classic 2 coil system. . . . For
>>example, take this new flat secondary and place a
>>2 turn primary 5" below it. . . .
>Once again, while you are probably already aware of this I want to
>point out that the lecture "High Frequency Oscillators for
>Electro-therapeutic and Other Purposes," Electrical Engineer,
>November 17, 1898, includes material that is relevant to your
>project. For example,
> "When it is desired to use small currents of high tension, a
> secondary coil is resorted to, as illustrated in Fig. 2. (see
> http://www.tfcbooks.com/images/articles/1898-11-17/figs_1234.gif )
> I have found it from the outset convenient to make a departure from
> the ordinary ways of winding the coils with a considerable number
> of small turns. For many reasons the physician will find it better
> to provide a large hoop H of not less than, say three feet in
> diameter and preferably more, and to wind upon it a few turns of
> stout cable P.
>The secondary coil S is easily prepared by taking two wooden hoops h
>h and joining them with stiff cardboard. One single layer of
>ordinary magnet wire, and not too thin at that, will be generally
>sufficient, the number of turns necessary for the particular use for
>which the coil is intended being easily ascertained by a few trials.
>. . . Additional advantages . . . will be found in the perfect
>regulation which is effected merely by altering the distance between
>the primary and secondary, for which adjustment provision should be
>made, and, furthermore, in the occurrence of harmonics which are
>more pronounced in such large coils of thick wire, situated at some
>distance from the primary.
>Two things are again made apparent from this particular description,
>1) the central axis of the two inductors is horizontal, and 2)
>coupling between the coils is adjustable, with the primary being
>fixed in position and the secondary being moveable.
>You can find the entire text of the lecture along with its
>illustrations posted at http://www.tfcbooks.com/tesla/1898-11-17.htm .
>I also want to point out that Tesla modified his 8-foot flat-spiral
>secondary in or before 1898 by doubling the spacing of the inner
>turns, as can be just seen in the 1901 Houston St. lab photo at