312 DEVELOPMENT OF HEAT. chap. xvii.
of side. Alternate plates are smooth, and the others are in the form of a grid, made up of 80 pieces of notched aluminium strips, each of which possesses 111 points. The smooth and grid plates are separated by thin plates of glass. Five pairs of these are combined to one system. A combina- tion of eight such systems, when actuated by an induction coU whose primary current was 5*9 amperes at a tension of 85 volts — I.e. absorbed 500 watts — and whose secondary current was at a tension of 3000 volts, gave 60 grams of ozone per hour. The air is blown through the various systems ; on account of the small amount of energy trans- formed, no particular cooling apparatus is said to be required.
�� �
