Abstract: A tubular anode such as tubular cast iron, magnetite, graphite, carbon or steel may be provided with an easily made internal or center connection having assured uniform resistance characteristics by the employment of at least two diametrically opposed wedge blocks, such blocks having parallel crowned and serrated contact surfaces and a wedge surface interface, such interface including a tongue and slot connection between the blocks, one or both blocks having oppositely extending tubular crimpable lead connections. The blocks may be made of malleable material so that when assembled and placed in the proper location inside the anode, one may be held while the other is driven axially, or both may be driven in axially opposite directions easily to form an electrical connection of assured electrical resistivity.

Abstract: An anode having an elongated body which may be extruded contains a bore extending at least partially through the body. The bore has an intermediate portion between the ends of the anode. A lead wire in the bore is fastened to a connector member having a self-tapping thread engageable at predetermined torque with the surface of the bore at the intermediate portion for cutting a thread in the bore upon relative rotation of the connector member and the body of anode material. A sealant is inserted in the bore after a thread is cut in the bore and surrounds the left in place connector member preventing moisture from reaching the connection to the anode at the intermediate portion.