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Re: Undamped oscillations
Original poster: Ed Phillips <evp@xxxxxxxxxxx>
Original poster: "Gary Peterson" <g.peterson@xxxxxxxxxxxx>
Original poster: "Lau, Gary" <Gary.Lau@xxxxxx>
Anyone who has ever scoped the secondary activity on a disruptive coil
can see that all activity is over long, long, long before the start of
the next bang. With the inherent losses in any secondary system, this
just is the way it is.
"In the practical carrying out of any of the plans
described it is essential to the attainment of good results that all
the apparatus be constructed and operated under careful observance of
the rules which have been fully set forth in the application referred
to at the beginning. Unless they are closely adhered to the insertion
of a composite tuned system in a resonating circuit, instead of
accomplishing the object sought, may prove detrimental. The
requirements indispensable to successful use of the invention are:
first, very small distributed capacity in the coils; second,
extremely low ohmic resistance of all conductors including the
connections and coatings of condensers; third, insignificant
electro-magnetic radiation; fourth, minimum loss in the capacities
through dielectric hysteresis and leakage and, fifth, a number of
units such as will insure the best performance in any given case. It
is to be added, however, that each of the individual condensers
should be of a capacity equal to that of the antenna, though this
relation may be departed from, more or less, without serious
drawback." -- Nikola Tesla, ca. 1916"
Quote from Tesla patent 512,430 Jan. 9, 1894:
Partial quote, lines 39 through 50 - "I have found that in every
coil there exists a certain relation between its self-induction and
capacity that permits a current of given frequency and potential to
pass through it with no other opposition than thoat of ohmic
resistance, or, in other words, as though it possessed no
self-induction.. This is due to the mutual relations existing
between the special character of the current and the self-induction
and capacity of the coil, the latter quantity being just capable of
neutralizing the self-induction for that frequency."
Partial quote, lines 67 through 78 - "In order to attain my
objective and to properly INCREASE the capacity of any given coil, I
wind it in such was as to secure a greater difference of potential
between its adjacent turns or convolutions, and since the energy
stored in the coil -- considering the latter as a condenser, is
proportionate to the square of the potential difference between its
adjacent convolutions, it is evident that I may in this way secure by
a proper disposition of these convolutionsa greatly increased
capacity for a given increase in potential between the turns."
Partial quote, lines 32 through 38 - "I would here state that by
the term coils I desire to include generally helices, solenoids, or
in fact, any conductor the different parts of which by the
requirements of its application or use are brought into such
relations with each other as to materially increase the self-induction".
The patent drawing shows a bifilar spiral coil but I can't find
any further statement about it or of any special properties attributed to it.
Bottom line is that in 1894 Tesla apparently thought
self-capacitance was enough of a virtue to patent it. By 1916 he had
obviously learned otherwise.