Re: MIT wireless energy transfer etc. (fwd)

["Tesla list" <tesla@xxxxxxxxxx>]

---------- Forwarded message ----------
Date: Sun, 29 Jul 2007 19:09:29 -0600
From: Gary Peterson <g.peterson@xxxxxxxxxxxx>
To: Tesla list <tesla@xxxxxxxxxx>
Subject: Re: MIT wireless energy transfer etc. (fwd)

>> . . . capacity loaded coils would have . . . higher Q. . . .
> . . . top capacitance lowers Q. . . .

There are three different wireless energy transmission methods associated 
with the name Nikola Tesla: 1) radio, 2) induction, and 3) "disturbed charge 
of ground and air."  The first method is radiative; methods #2 and #3 do not 
involve electromagnetic radiation, i.e., "radio waves."  You are presently 
confusing #2 and #3.

Methods 1 and 3 involve a series of four concatenated tuned circuits for the 
wireless transmission of electrical energy, two at the transmitter and two 
at the receiver.

Tesla also used a series of four concatenated tuned circuits for the 
wireless transmission of energy by electromagnetic induction.  This work 
started at 35 South 5th Ave., and was subsequently adopted for lighting 
purposes at the 46 Houston St. laboratory. [NIKOLA TESLA  GUIDED WEAPONS & 
COMPUTER TECHNOLOGY, Anderson, L.I., Ed., Twenty First Century Books, 
Breckenridge, 1998, p. 62.]  Tesla also used the induction energy 
transmission method at Colorado Springs in order to test its efficacy as 
compared with the "disturbed charge of ground and air method."  In this case 
the induction transmitter contained three of the tuned circuits, and the 
receiver was a single tuned circuit comprised of a one-turn inductance and a 
capacitor.

     "This [shown in Fig. 59] is transmission of energy by induction.  Here 
is a tuned circuit, you see, out in the field with three incandescent lamps 
and a condenser.  The energy is transmitted inductively, from the 
oscillator.  In this case, I have the primary supply circuit, the energizing 
condenser circuit, the primary inducing circuit, and the secondary in the 
field as in the fourth circuit, all tuned -- four circuits in resonance." 
[NIKOLA TESLA ON HIS WORK WITH ALTERNATING CURRENTS . . . , pp. 93-94.]  ". 
. . it is found that with the above circuits and under such conditions about 
1 mile communications should be possible.  With circuits 1000 meters square, 
about 30 miles.  From this, the inferiority of the induction method would 
appear to be immense as compared with disturbed charge of ground and air 
method." [NIKOLA TESLA  COLORADO SPRINGS NOTES  1899-1900, p. 29.]


----- Original Message ----- 
> From: Chris Swinson <list@xxxxxxxxxxxxxxxxxxxxxxxxx>
> Subject: Re: MIT wireless energy transfer etc. (fwd)

>> From: Ed Phillips <evp@xxxxxxxxxxx>
>>
>> . . . My personal thought would be that capacity loaded coils would have 
>> less loss [higher Q]. . . .

> imho top capacitance lowers Q.
>
> chris