Improvements in the Manufacture of Electrodes for Ozonisers.
Year: 1892

page_text: COMPLETE SPECIFICATION.
Improvements in the Manufacture of Electrodes for Ozonisers.
I EMILE ANDREOLI Journalist, of 18 Somerleyton Road, Brixton, S.W. Surrey
do hereby declare the nature of this invention and in what manner the same is
to be performed, to be particularly described and ascertained in and by the following
statement:―
This invention refers to the construction of certain point-bearing metallic plates
or their equivalents not described in my Specifications Nos. 17426 1891, 9631 1892,
but which have been specified in my Patents in France, 13th of October, 1892,
207706, 14th of April, 1892 No. 207707, and 23rd May '92, No. 208654, Belgium
2nd of June No. 75564 Italy, 20th of July 1892, No. 32365, Spain 9th, of
August, '92, No. 13557, and elsewhere.
In addition to the methods described in my aforesaid English Patents, point-
bearing plates or their equivalents as therein mentioned, can be economically
obtained by casting in appropriate moulds or by punching, or stamping, sheets of
metal in such manner that on one side or on both sides the edges of holes punched
by appropriate tools or angular portions of the metal plate of convenient form and
size are made to protrude or project. Such protrusions or projections act in
relation to the electric current in the same manner as pins fixed by rivetting in or
soldering on a metal plate and are much less costly to produce.
The same result may also be obtained by using fret-saws band-saws, or serrated
wire fixed on a metal frame or upon wires crossing them at right angles or at any
convenient angle so as to form with them a sort of trellis through which air can
freely circulate, the toothed edges of such saws or serrated wire thus mounted
being then fixed facing and close to a dielectric sheet with an electrode on the
other side of it, such as an enamelled plate of metal, or thin glass tubes containing
electrodes or enamelled metal rods.
It must therefore be understood that the characteristic feature of my invention
being the employment of metallic points, edges, angles or asperities on which the
electric tension is at its maximum and from which electricity is discharged much
more freely than from a flat undulated or corrugated surface, I do not confine
myself to pins, nails, spikes or wires of metallic brushes, but I can employ and
combine in any suitable apparatus on a large as well as on a small scale for
producing ozone, all suitably pointed acute or sharp edged metallic projections
from which the electric discharge flows constantly as the resistance of the
surrounding air has not on points the effect it has on flat surfaces.
Fig. 1. shows an apparatus in the form of a music stand, consisting of a sheet of
glass backed with tin foil or tin plate and over which are stretched fret or band
saws or serrated wires.
Fig. 2 shows some forms of single and double serrated wires.
Fig. 3. shows a strip of metal, serrated which afterwards is tinned on the centre
of which a rod is soldered to keep it rigid. As many of these as desirable can
be fixed on a frame opposite and close to a sheet of glass, behind which is a
metallic plate.
Fig. 4. shows the protruding tongues or edges which can be produced by a
punching machine, presenting asperities facilitating the electric discharge.
Fig. 5. shows a very simple arrangement by which a sort of grid or trellis is
formed of serrated wires attached by fine wire or solder to strong wires crossing
them at right angles or at any convenient angle-so as to form a trellis point
bearing on one side, or, if the cross wires are formed of serrated wire, on both
sides

page_text: Having now particularly described and ascertained the nature of this inven-
tion and in what manner the same is to be performed, I declare that what I
claim is :
In the construction of electrodes for open or closed ozonisers
1st. The use of plates of tin or other metals cast, cut or stamped so as to form
sharp edges tongues or angles protruding from one or both sides acting as points to
facilitate the electric discharge.
2nd. The use of fretsaws or serrated wire or their equivalents supported on a
frame or on cross bars, and from the many points of which the silent discharge
takes place.
Dated this 28th dow of November 1800
EMILE ANDREOLI.