How to Build a Spark Coil Ozonator
By Frederick Von Lichtenow
It is a well-known fact that the electric discharge across an
air-gap liberates "ozone" freely, and further, that the production
of this ozone may he many times increased by allowing the discharge
to pass between metal sheets, preferably tinfoil.
Making use of these facts, the simple "ozonator" - attachment here
shown constitutes a practical piece of auxiliary apparatus for any
spark coil of 1-inch rating or more.
Two oblong sheets of corrugated packing board of equal dimensions;
two sheets of heavy tinfoil cut to approximately the same size, but
slightly longer; two pieces of medium gage copper wire, a wooden or
cardboard box (without cover), and a cone shaped tube of some
material, other than metal, form the essential parts for its
construction (Fig. 1).
An application of paste or shellac secures the tinfoil to the
packing board, which merely serves as a support for the foil.
The foil extensions, due to its being longer, are pasted around
over the exposed corrugations at either end of the packing board,
ending with the back edge of the latter. The whole is then fastened
to the wire by running the same thru the foil into one of the
centermost corrugations, at the same time furnishing the necessary
electrical contact between wire and foil (Fig. 2).
The distance between the foil sheets and their respective size are
governed entirely by the rated spark length of the coil employed,
with a proportionate amount of generated ozone as a consequence.
They should, at any rate, be placed in a position parallel to one
another (in the same plane) and at such a distance where a silent
discharge (in reality there is a heavy "brush-discharge,"
consisting of a stream of violet-colored spark-threads passing
between the foil sheets, which can be easily ascertained in a
dimly-lighted room) manifests itself, allowing only an occasional
spark to pass. (This distance is somewhere in the neighborhood of
one-half of that of the spark discharge between needle points.)
The cone is secured to the box by being pushed thru the opening on
top of the latter from the inside until it fits tight. Some
friction tape is finally run over the seams of the box as well as
around the joint of the latter, with the cone and the whole placed
over the generating apparatus (Fig. 3).
The box should be only slightly wider than the top of the spark
coil, just wide enough to allow air to pass thru, and there should
be ample room inside of it to clear the foil sheets all around by
An important point is that the packing board be perfectly straight
and the tinfoil applied smoothly, in order to insure uniform
distribution of the electrical stress between the foil surfaces.
Otherwise, the discharge will localize upon certain spots,
resulting in a decreased ozone output.
The "ozonator" is used for air purifying, inhaling or experimental
purposes in general.
If an "Electro-Bulldog" coil is available then a taller box will be
required and the same slipt over the spark coil as well.
Semi-circular cuts on two sides for the passage of air and two
small holes on one side of the box for the insertion of the primary
wires are to be provided (Fig. 4).
The author has a zinc spark gap mounted across the coil
secondaries, which is of a great advantage, in that it permits of a
far finer adjustment of the sheet electrodes than could be possibly
had by using the regulation style of binding post terminals.
Good results are obtained with both types of arrangements as
outlined in the foregoing.
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