Publisher Summary In certain applications, it is necessary to use a combination of elements or bars made from different materials, each material performing a different function. In overhead electric cables, for example, it is often convenient to carry the current in a set of copper wires surrounding steel wires, the latter being designed to support the weight of the cable over large spans. Such combinations of materials are generally termed compound bars. This chapter discusses compound bars that are symmetrically proportioned such that no bending occurs. When an external load is applied to such a compound bar it is shared between the individual component materials in proportions depending on their respective lengths, areas, and Young's moduli. The chapter also provides derivation for a compound bar construction from members of different materials, lengths, and areas subjection to an external tensile or compressive load W.