Re: Wire Length (fwd)

["Tesla list" <tesla@xxxxxxxxxx>]

Moderated and approved by: Gerry Reynolds <greynolds@xxxxxxxxxx>



---------- Forwarded message ----------
Date: Sat, 23 Dec 2006 17:03:12 -0800
From: Barton B. Anderson <bartb@xxxxxxxxxxxxxxxx>
To: Tesla list <tesla@xxxxxxxxxx>
Subject: Re: Wire Length (fwd)

Thanks Gary. I have not read the text but did gather the info. and the 
rest was right there in the photos. I actually counted the turns via a 
decent photo and interpreted id, od, turn spacing, etc. Thanks for 
posting this.

Take care,
Bart

Tesla list wrote:

>Moderated and approved by: Gerry Reynolds <greynolds@xxxxxxxxxx>
>
>---------- Forwarded message ----------
>Date: Sat, 23 Dec 2006 09:28:03 -0700
>From: Gary Peterson <g.peterson@xxxxxxxxxxxx>
>To: Tesla list <tesla@xxxxxxxxxx>
>Subject: Re: Wire Length (fwd)
>  
>
>While I realize you probably already have this, here is Tesla's own 
>description of the original oscillator, including the primary.
>
>    "I have here a cut from the Electrical Review of October 26, 1898, in 
>which there is shown in the background a flat spiral coil which I have 
>marked A, and which is the coil in question.  There is a frame made of wood, 
>which I have marked F, and which in reality is 8 by 8 feet, as before 
>stated, and upon which there are wound, upon notched supports, about 50 
>turns of well insulated cable No. 8.  The end of the coil, which is on the 
>outer side of the spiral, was usually connected to the ground, and the end 
>in the center to the insulated conductor of capacity, not shown in the cut. 
>The coil is easily recognizable in the figure, presenting, as it does, the 
>appearance of a spider web.  B is a coil supported on an insulated stand in 
>front. . . . The primary is not shown here, being behind the frame. To 
>excite the apparatus I used condensers which were charged from the 50 
>kilovolt transformer and discharged in rapid succession through the primary. 
>The transformer is not visible. [Nikola Tesla  Guided Weapons & Computer 
>Technology, Leland I. Anderson, Twenty First Century Books, 1998, pp. 
>12-13.]
>
>    "This picture shows, or is a general view of, a part of my laboratory at 
>46 East Houston Street, New York City, and shows several apparata which I 
>have used in practicing this invention, and to which I have referred.  The 
>spiral coil before described wound on a square 8 by 8 feet, made of wood, is 
>shown in the background.  Looking at it, to the left will be seen a square 
>frame of wood in which there were contained two turns of heavy cable, which 
>I could connect either in series or multiple arc.  Those primaries, or 
>respectively primary, were used when I desired to obtain two oscillations in 
>the manner explained in my answer to question 16.  The spiral coil could be 
>approached more or less to the frame, being placed on rollers for 
>convenience, and thus I would graduate the mutual induction so that two 
>oscillations resulted; one, considerably quicker, during the time interval 
>when the primary or exciting circuit was closed, and another, slower one, 
>during the interval when the primary was opened by the make-and-break disk, 
>but both following each other in rapid succession so as to be practically 
>simultaneous as far as the operation of the receiver is concerned.  Farther 
>to the left may be observed some condensers which I used in addition to 
>those already described.  In front of the picture will be seen the receiving 
>apparatus in the form of a table which had two circuits, the terminals of 
>which were connected to binding posts or studs.  This is the receiving 
>apparatus which I have described in my answer to question 23." [NTGW, Leland 
>I. Anderson, Twenty First Century Books, 1998, pp. 41-42.]
>
>The "picture" is posted at 
>http://www.teslascience.org/archive/descriptions/picture07.htm .  A diagram 
>of the primary circuit is posted at 
>http://www.teslaradio.com/images/14-035.gif .
>
>Gary 
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