Year: 1898

page_text: Date of Application, 21st Nov., 1898
Complete Specification Left, 14th Aug., 1899-Accepted, 16th Sept., 1899
I, Baron HENRY TINDAL, of 12, Sarphatikade, Amsterdam, in the Kingdom of
Holland, do hereby declare the nature of this invention to be as follows:-
The object of this invention is to produce ozone in larger quantities and in a
cheaper and simpler manner than hitherto.
Experiments heretofore conducted to generate ozone economically and on a
commercial scale, were based upon the principle of the influence of dark electrical
discharges upon the gas to be ozonized, together with a cooling of the gas each
time the same passed through the discharging poles, the purpose being to obtain
a gas of high concentration.
In this manner, it is true, a comparatively high concentration was obtained,
but the expense of this method of production was not in proportion to the result in
consequence of the necessity of the periodical recooling of the gases.
I have now ascertained that a considerable higher result may be obtained, if
the cooling be disregarded, and care only taken, that the ozonized gas caused to pass
through an extended even and dense discharging field. On this principle the
apparatus forming the subject of the present invention is based.
The one discharging pole consists of a kind of semicircular metal trough, which
upon the surface where the discharge takes place, is provided with a slight layer
of enamel. The semicircular trough closed or covered by means of a plate of good
insulating glass, is secured in position by lead strips or the like, so that the metal
trough with the glass plate forms a conducting channel for the gas to be ozonized.
At the same time the glass disc serves as carrier for the second discharging pole.
This consists of a comparatively large number of semicircular metal discs which
are attached or secured in suitable manner and in a straight or slanting line to
the glass plate so that they come to lie within the gas-conducting channel with
their edges concentric to the surface of the channel.
In consequence of the absolutely equal distance of all points of the both dis-
charging poles, from each other an entirely even passing over of the high tension
current is obtained without any risk of a flamé arc forming, as there is an entire
absence of all extending or projecting edges. Thus the resistances to be shunted
into the high tension service may be very small, moreover it has been found that
even the slight layer of enamel upon the semicircular trough suffices in most cases.
The enamel layer is employed, in order to remove or compensate for the small
irregularities of the cast iron, from which material the trough for purposes of
economy is manufactured, and in order to render any treatment (with the object
of obtaining a smooth surface of the inner channel) unnecessary.
The metal discs may receive suitable dimensions and inclinations so as to pro-
duce a corresponding whirling or like motion of the gas, due consideration being
given to ensure the distances of the rounded edges of the metal discs from the
channel being equal at all points.

page_text: An Improved Apparatus for Generating Ozone.
I, Baron HENRY TINDAL, of 12, Sarphatikade, Amsterdam, in the Kingdom of
Holland, 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:-
The object of this invention is to produce ozone in large quantities and in a
cheaper and simpler manner than hitherto.
Experiments heretofore conducted to generate ozone economically and on a
commercial scale, were based upon the principle of the influence of silent electrical
discharges upon the oxygen to be ozonized, together with a cooling of the gas each
time the same passed through the discharging poles, the purpose being to obtain
a gas of high concentration.
In this manner. it is true, a comparatively high concentration was obtained.
but the expense of this method of production was not in proportion to the result in
consequence of the necessity of the periodical recooling of the gases.
I have now ascertained that a considerable higher result may be obtained, if
the cooling be disregarded, and care only be taken, that the ozonized gas passes
through an extended even and dense discharging field. On this principle the
apparatus forming the subject of the present invention is based.
The one discharging pole consists of a kind of semicircular metal trough, which
upon the surface where the discharge takes place, is provided with a slight layer
of enamel. The semicircular trough closed or covered by means of a plate of good
insulating glass, is secured in position by lead strips or the like, so that the metal
trough with the glass plate forms a conducting channel for the gas to be ozonized.
At the same time the glass disc serves as carrier for the second discharging pole.
This consists of a comparatively large number of semicircular metal discs which
are attached or secured in suitable manner to the glass plate so that they lie
within the gas conducting channel with their edges concentric to the surface of
the channel.
In consequence of the absolutely equal distance of all points of both the dis-
charging poles from each other an entirely even passage of the high tension
current is obtained without any risk of a flame arc forming, as there is an entire
absence of all extending or projecting edges. Thus the resistance to be shunted
in the high tension service may be very small, moreover it has been found that
even the slight laver of enamel upon the semicircular trough suffices in most cases.
The enamel layer is employed, in order to remove or compensate for the small
irregularities of the cast iron, from which material the trough for purposes of
economy is manufactured, and in order to render unnecessary any treatment with
the obiect of obtaining a smooth surface of the inner channel.
In order to make my invention more clear, I refer to the accompanying draw-
ing, in which one form of carrying my invention into effect is shown, and in
which:
Figure 1 is a longitudinal section,
Figure 2 a plan. and
Figures 3 and 4 are respectively a cross section and longitudinal section through
the end of the apparatus drawn to a larger scale.
Proceeding to describe the drawing: In the casing a is the semicircular
channel with the enamel laver 7. The channel is covered by the glass plate c
which latter is held by angle-shaped spring metal strips which are held down
by screws e. The glass-plate is preferably in two pieces, the separation being

page_text: The
formed by a middle support 7, the left hand part of the plate c rests upon the sup-
ports m and 1, while the right hand part rests upon the supports 7 and n.
The
fixing is effected by the foresaid metal strips d, as clearly illustrated in Fig. 3.
The glass-plate is provided with a number of holes in which screws f are inserted.
Semicircular metal discs g are attached to the slotted heads of said screws.
said screws f and also the said discs are held in position by nuts h. The high
tension current is preferably directly introduced into the apparatus at the
screws and if desired, liquid resistances may also be inserted in the circuit:
the other pole of the high tension service is directly connected to the casing a.
The gas to be ozonized is conducted through the opening into the conduit
formed by the channel b and the glass-plates c and is conducted away through
the opening. During the time the gas passes through the said conduit, the
electric current passes uniformly and evenly in dark discharges from the discs g
to the enamel layer or surface b₁ of the channel b.
The metal discs g may be of suitable dimensions and inclinations so as to pro-
duce a corresponding whirling or like motion of the gas, due consideration being
given to ensure that the outer circumference of each of the metal discs g is equally
distant at all points from the surface of the channel b.
Having now particularly described and ascertained the nature of my said
invention, and in what manner the same is to be performed, I declare that what
I claim is: :-
The herein described apparatus for the generation of ozone, comprising a semi-
cylindrical metallic vessel having inlet and outlet for gases, a dielectric layer
upon its concave surface, a glass-plate resting upon and closing said vessel, a series
of semi-circular metallic dises depending from said glass-plate and electrical con-
nections to said vessel and discs, for the purpose as described.
JENSEN & SON.
77, Chancery Lane, London, W.C. Patent Agents.