through the secondary (broken arrows). This current flows up to the center terminal of the secondary of RC1, where it
divides equally into the two branches, since the branch resistances of a perfectly balanced line are equal. Since the current
in the upper winding of the secondary of RC1 is flowing up, and an equal current in the lower half is flowing down
(broken arrows), the resultant voltage across the secondary is zero. Therefore, no corresponding emf is induced in the
primary of RC1, and no corresponding current flows in the receiver of set T1.
FIGURE 70. Phantom Telephone Circuit