Type Subsumption as a Model of Computation

An igniting apparatus for internal combustion engines comprises a central igniting electrode disposed at the position adjacent to an opening communicating, between an auxiliary combustion chamber and a main combustion chamber, an earthed electrode consisting of an inner circumferential portion in close to the opening and an electric source means supplying discharge voltage between both the electrodes, whereby lean mixture can be easily ignited and the electric source means has a sufficient discharge duration to energize the mixture and combustion gases passing said opening.