Anode for cathodic protection system

Claim 1

AN ANODE OF THE CHARACTER DESCRIBED FOR A CATHODIC PROTECTION SYSTEM, COMPRISING IN COMBINATION A GENERALLY CYLINDRICAL BODY PORTION OF HIGH SILICON CONTENT CAST IRON, SAID SILICON CONTENT RENDERING SAID BODY TOO HARD AND BRITTLE FOR READY MACHINING, AN ELONGATED GENERALLY CYLINDRICAL RECESS IN THE END OF SAID BODY PORTION, AN ELONGATED INSERT OF MATERIAL DIFFERENT FROM SAID HIGH SILICON CONTENT CAST IRON INCLUDING AT LEAST A THIN WALL PORTION HAVING AN EXTERNAL DIAMETER PROPORTIONED WITH RESPECT TO THE INTERNAL DIAMETER OF SAID RECESSS PROVIDING AN INTERFERENCE FIT CONNECTION WITH SAID BODY PORTION WITHIN SAID RECESS AND AT A LOCATION SPACED FROM THE OUTER END THEREOF, A PERIPHERAL GROOVE IN SAID RECESS, A SNAP RING RECEIVED IN SAID GROOVE AND COOPERATING WITH SAID THIN WALL SECTION TO EFFECT SUBSTANTIAL LIMITED AXIAL MOVEMENT OF SAID INSERT AGAINST PULLING FORCES ENCOUNTERED IN USE, AN INSULATING LEAD WIRE EXTENDING FROM SAID INSERT OUT OF SAID RECESS, MEANS COOPERATING WITH SAID INSERT FOR AFFIXING SAID LEAD WIRE THERETO EFFECTING AN ELECTRICAL CONNECTION FROM SAID LEAD WIRE THROUGH SAID INSERT TO SAID BODY PORTION AND EFFECTING A STRONG MECHANICAL CONNECTION BETWEEN SAID LEAD WIRE AND SAID BODY PORTION FOR WITHSTANDING PULLING FORCES ENCOUNTERED IN USE, AND A PLASTIC INSULATING MEANS IN SAID RECESS COVERING SAID INSERT AND SAID LEAD WIRE FOR INSULATING SAID LEAD WIRE AND SAID INSERT BOTH CHEMICALLY AND ELECTRICALLY.