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A phantom circuit good enough for call circuit purposes would be good enough for actual commercial messages, therefore, it is customary to furnish such originating and receiving operators with Morse telegraph sets.

The currents of the phantom circuit, unlike those of the physical circuits, are in the same direction in both wires of a pair at any instant.

A phantom circuit is formed most simply when both physical lines end in the same two offices.

If one physical line is longer than the other, a phantom circuit may be formed as in Fig.

In phantom circuits formed merely by inserting repeating coils in physical circuits and doing nothing else, an exact balance of the sides of the phantom circuit is lacking.