dielectric the discharge electrode is made of molybdenum tungsten niobium or tantalum and is directly exposed to the oxygen flow application_number US 78554291 A description the test results disclosed hereinafter were achieved by means of an arrangement according to german laying open specification 37 31 168 shown in fig1 and with which a dielectric 1 is used that is designed as an elongated tube made of ceramic materials in particular al 2 o 3 as a discharge electrode 3 a wire having a diameter of preferably 0 5 mm is used which however may also be larger e g 1 mm the wire is in the form of a helix and is inserted under tension in the interior of the tubular dielectric 1 the tubular dielectric 1 is embraced by an outer tube 4 a cooling medium 5 namely water being directed into the space between a counterelectrode 2 and the outer tube 4 and at the same time serving as the counterelectrode the wire is preferably made of molybdenum or tungsten but niobium or tantalum may also be used the application of which however yields a result that is somewhat poorer than that achieved by using molybdenum and tungsten the parameters which are of importance in the production of ozone are indicated by the following ozone production means that quantity mass of ozone which man be produced during a given period by means of the apparatus.