Spark plug

Claim 1

A SPARK PLUG COMPRISING A HOLLOW BODY HAVING AN INTERNAL SPACE DEFINING AN IGNITION CHAMBER, THE FREE VOLUME OF WHICH PROVIDES A PREDETERMINED HEAT RANGE FOR SAID SPARK PLUG; A CLOSURE FOR SAID CHAMBER AT THE END OF SAID SPARK PLUG THAT COMMUNICATES WITH THE INTERIOR OF AN ENGINE CYLINDER; SPACED APART ELECTRODES WITHIN SAID CHAMBER FORMING A SPARK GAP; MEANS PROVIDING INGRESS AND EGRESS OF GASES FROM SAID ENGINE CYLINDER TO SAID CHAMBER; AND A MEMBER WITHIN SAID CHAMBER FORMING AN ENTRAPPING COMPARTMENT OF SUBSTANTIALLY CONSTANT CROSS SECTION EXTENDING A SUBSTANTIAL DISTANCE BEYOND SAID SPARK GAP IN EACH DIRECTION FOR MAINTAINING THE FUEL-AIR MIXTURE SURROUNDING SAID SPARK GAP AT SUBSTANTIALLY BEST POWER MIXTURE WHEN SAID FUEL-AIR MIXTURE IS RICHER THAN BEST POWER MIXTURE, SAID MEMBER WITHIN SAID CHAMBER BEING ADAPTED TO BE LOCATED IN DIFFERENT POSITIONS WITHIN SAID CHAMBER WITHOUT MATERIALLY AFFECTING SAID HEAT RANGE OF SAID SPARK PLUG.