A new ozone generator has been recently brought out in London and is described in the Electrical Beview, of that city, for November 11. The apparatus consists of a mahogany box about 16x28 in., lined with asbestos board. At one end is a small electric fan producing the necessary circulation of air. Several baffle plates are placed within the box, on which the ozonizing girds are fixed. The box also contains a small step-up transformer for producing the necessary high potential.

The baffle plates consist of thin sheets of highly insulating material, such as micanite, on each side of which sheetsof copper gauze having forty meshes to the inch are fixed. These sheets are connected alternately to the two poles of the step-up transformer, which gives a potential difference of 4,500 volts, this having been found by experiment to be the best pressure for the purpose. The ozonizing surfaces have an area of about four square feet. As at each corner of each mesh of the gauze the wire is necessarily bent so as to form an elevation, which may be regarded as a round-point, there are 230,400 such points to a square foot of the ozonizing surface, giving a total of over 900,000 points in the apparatus from each of which a discharge takes place. Owing to this extreme subdivision of the discharge there is said to be no sparking and no formation of nitrous compounds. It is said that this apparatus is capable of ozoning 30,000 _cubic feet of air per hour, with an expenditure of sixty watts, including all the losses.