ils.

A NEW METHOD.

For the past ten or fifteen years the manufacture of ozone, for the
reasons related above, has remained in abeyance, and it is to a new
mode, which will, I trust, mark another stage of advancement, that I
now wish to direct attention. Some years since, Mr. Wimshurst, a most
able electrician, invented the electrical machine which goes by his
name. The machine, as will be seen from the specimen of it on the
table, looks something like the old electrical machine, but differs in
that there is no friction, and that the plates of glass with their
metal sectors, separated a little distance from each other, revolve,
when the handle of the machine is turned, in opposite directions. The
machine when it is in good working order (and it is very easily kept
in good working order) produces electricity abundantly, and in working
it I observed that ozone was so freely generated, that more than once
the air of my laboratory became charged with ozone to an oppressive
degree. The fact led me to use this machine for the production of
ozone on a large scale, in the following way.

From the terminals of the machine two wires are carried and are
conducted, by their terminals, to an ozone generator formed somewhat
after the manner of Siemens', but with this difference, that the
discharge is made through a series of fine points within the
cylinders. The machine is placed on a table with the ozone generator
at the back of it, and can be so arranged that with the turning of the
handle which works the machine a blast of air is carried through the
generator. Thus by one action electricity is generated, sparks are
discharged in the ozone generator, air is driven through, and ozone is
delivered over freely.

If it be wished to use pure oxygen instead of common air, nothing more
is required than to use compressed oxygen and to allow a gentle
current to pass through the ozone generator in place of air. For this
purpose Brin's compressed oxygen is the purest and best; but for
ordinary service atmospheric air is sufficient.[2]

[Footnote 2: For illustration to-day, Messrs Mayfield, the
electrical engineers of Queen Victoria Street, E. C., have been
good enough to lend me a machine fitted up on the plan named. It
works so effectively that I can make the ozone given off from it
detectable in every part of this large hall.]

The advantages of this apparatus are as follows:

1. With care it is always ready