the piston 14 moving in toward the cylinder or to the rightwith respect to the orientation of fig1 contact 40 is connected to the insulated terminal of the spark plug 36 contact 42 is connected to the positive terminal of a high voltage alternating current source the cylinder wall which is made from metal is connected by a wire 46 to the common terminals of the alternating current source a single power source 48 is indicated which must supply high voltage alternating current to thespark plug 36 and direct low voltage current through a controller 50 to the electrode plates 22 of the electrolytic cell the power source 48 may be an alternating current source having an ac dc convertor for powering the electrolytic cell or it may be a direct current source having a dc acconvertor for powering the spark plug such dc ac convertors are used in the electronic ignition systems of most automobiles produced today and generally involve the use of a transistor chopping circuit in conjunction with the primary of a transformer the chopper circuit changes the dc input to a square wave which is in effect an alternating current which can then be stepped up by a teslacoil and used to fire the spark plug whenever the piston disengages switch.