In Fig. 284 is shown the non-ring-through arrangement of cord circuit adopted by the Monarch Company.  In this system the clearing-out drop has two windings, either of which will operate the armature.  The two windings are bridged across the cord circuit, with a 1/2-microfarad condenser in series in the tip strand between the two winding connections.  While the low-capacity condenser will allow the high-frequency talking current to pass readily without affecting it to any appreciable extent, it offers a high resistance to a low-frequency ringing current, thus preventing it from passing out on a connected line and forcing it through one of the windings of the coil.  There is a tendency to transformer action in this arrangement, one of the windings serving as a primary and the other as a secondary, but this has not prevented the device from being highly successful.

A modification of this arrangement is shown in Fig. 285, wherein a double-wound clearing-out drop is used, and a 1/2-microfarad condenser is placed in series in each side of the cord circuit between the winding connections of the clearing-out drop.  This circuit should give a positive ring-off under all conditions and should prevent through ringing except as it may be provided by the transformer action between the two windings on the same core.

[Illustration:  Fig. 285.  Non-Ring-Through Cord Circuit]

Another rather ingenious method of securing a positive ring-off and yet of preventing in a certain degree the undesirable ringing-through feature is shown in the cord circuit, Fig. 286.  In this two non-inductive coils 1 and 2 are shown connected in series in the tip and sleeve strands of the coils, respectively.  Between the neutral point of these two non-inductive windings is connected the clearing-out drop circuit.  Voice currents find ready path through these non-inductive windings because of the fact that, being non-inductive, they present only their straight ohmic resistance.  The impedance of the clearing-out drop prevents the windings being shunted across the two sides of the cord circuit.  With this circuit a positive ring-off is assured even though the line connected with the one sending the clearing-out signal is short-circuited or open.  If it is short-circuited, the shunt around the clearing-out drop will still have the resistance of two of the non-inductive windings included in it, and thus the drop will never be short-circuited by a very low-resistance path.  Obviously, an open circuit in the line will not prevent the clearing-out signal being received.  While this is an ingenious scheme, it is not one to be highly recommended since the non-inductive windings, in order to be effective so far as signaling is concerned, must be of considerable resistance and this resistance is in series in the talking circuit.  Even non-inductive resistance is to be avoided in the talking circuit when it is of considerable magnitude and where there are other ways of solving the problem.