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Re: Variable Capacitance and Inductance
Original poster: "Antonio Carlos M. de Queiroz by way of Terry Fritz <twftesla-at-qwest-dot-net>" <acmq-at-compuland-dot-com.br>
Tesla list wrote:
> Original poster: "David Thomson by way of Terry Fritz
> Continuing the investigation of this astonishing phenomenon I observed
> capacity varied with the elevation of the conducting surface above the
> and I soon ascertained the law of this variation. The capacity increased
> conducting surface was elevated, in open space, from one-half to
> three-quarters of 1 per cent per foot of elevation. In buildings, however, or
> near large structures, this increase often amounted to 50 per cent per
> elevation, and this alone will show to what extent many of the scientific
> experiments recorded in technical literature are erroneous. In
> length of the coils or conductors such as I employ in my system of wireless
> telegraphy, for instance, the rule which I have given is, in view of the
> important to observe.
If Tesla really wrote this, he had serious problems with the quality of
his capacitors. Capacitance and inductance depend on geometric factors
on the medium around the conductors (magnetic permeability for inductors
and dielectric constant for capacitors), and are only precise if the
geometry is precise and invariable and the medium is also fixed.
The text doesn't specify the capacitance of what is being discussed.
The figures look quite excessive even for very bad capacitors.
Makers of electronic parts for airplanes of space vehicles (or tall
buildings) would be in serious difficulties if the parameters of their
circuits were so variable.
Antonio Carlos M. de Queiroz