What is an electrical Britannia Splice?

The Britannia Splice is a connection between large solid wires. Several inches of each wire's insulation is removed and a ninety degree bend is made about a half inch from each end. The two wires are laid next to each other, with the bent ends separated by several inches. Another smaller wire, the wrapping wire, is wound around the assembly, starting from the center, in such a fashion that some turns go past the bent ends, after the point where the wrapping wire is wrapped on only one wire. The bent ends are then trimmed close.

While not as popular as the Long Tie Western Union joint, if properly made and soldered, the Britannia Splice is a very good splice.