Abstract :
An article based on two papers: Paper 4214S, entitled `The vacuum switch. Part 1: Properties of the vacuum arc¿, and Paper 42J5S, entitled `The vacuum switch. Part 2: Extinction of an a.c. vacuum arc¿, which will be published in the Proceedings. The papers will be read at a meeting of the Science and General Division on the 18th March 1963 at Savoy Place.