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should possess, besides instructive, also entertaining features and as such, a simple
experiment, such as the one cited, would not go very far towards the attainment of the
lecturer's aim. I must therefore choose another way of illustrating, more spectacular
certainly, but perhaps also more instructive. Instead of the frictional machine and Leyden
jar, I shall avail myself in these experiments, of an induction coil of peculiar properties,
which was described in detail by me in a lecture before the London Institution of Electrical
Engineers, in Feb. 1892. This induction coil is capable of yielding currents of enormous
potential differences, alternating with extreme rapidity. With this apparatus I shall
endeavor to show you three distinct classes of effects, or phenomena, and it is my desire
that each experiment, while serving for the purposes of illustration, should at the same
time teach us some novel truth, or show us some novel aspect of this fascinating science.
But before doing this, it seems proper and useful to dwell upon the apparatus employed,
and method of obtaining the high potentials and high-frequency currents which are made
use of in these experiments.
ON THE APPARATUS AND METHOD OF CONVERSION.
These high-frequency currents are obtained in a peculiar manner. The method
employed was advanced by me about two years ago in an experimental lecture before the
American 'Institute of Electrical Engineers. A number of ways, as practiced in the
laboratory, of obtaining these currents either from continuous or low frequency altemating
currents, is diagrammatically indicated in Fig. 1, which will be later described in detail. The
general plan is to charge condensers, from a direct or alternate-current source, preferably of
high-tension, and to discharge them disruptively while observing wcllknown conditions
necessary to maintain the oscillations of the current. In view of the
Figure 22
Illustration from a Tesla Lecture. February 1893
Chapter 3