Simultaneous telephony and telegraphy over long-distance small-gauge cables

Describes a composited quad from which can be derived three telephone and two duplex circuits by using the metallic polar duplex telegraph system. For a given number of cable quads composite operation provides four times more telegraph circuits than metallic super phantom and also does away with the difficulties often experienced when it is required to set up and maintain long telegraph super-phantom circuits, due to the great number of conductors per circuit.