Patent GB-190906447-A (GB)
Title: Improvements in the Enumeration of Telephone Calls.
Inventor: WILLIAMS SAMUEL DICKINSON
IPC: H04M15/30
Filed: 1909-03-18
Granted: 1910-03-18
Abstract: 6447. Williams, S. D. March 18. Metering systems.-In a telephone-call enumerating-system, the calls are registered simultaneously at the calling-subscriber's station and at the exchange, without any operation other than those ordinarily necessary to connect two subscribers being required, and ineffective calls, i.e., calls which the called subscriber does not answer, are not registered. To this end, the ordinary movements of calling up the exchange are utilized in a local-battery system to set the armature which operates the counter at the subscriber's station, and also the armature of the counter at the exchange, in such a position that, should a momentary counting-current be sent, these armatures are attracted and operate the counters. This momentary counter-current is sent when the called subscriber removes his receiver, this act completing a circuit, which includes the lines of both subscribers, but which is again immediately broken. In the local-battery subscriber's set shown in Fig. 1, the axial movement of the magneto shaft A<2> lifts the armature C away from its magnet G. The li'ting- up of the receiver swings round a lever-K and allows a pawl A to drop into the meter ratchet-wheel H. The meter is then operated if the magnet G is energized by a counting-current. According to the arrangement shown in Fig. 14, the counter armature C is attracted into the operative position by a magnet G', energized by the ringing current. The invention is also described with reference to alocalbattery system in which the exchange is called by the mere removal of the subscriber's receiver, and, in this case, special means are provided for preventing the actuation of the called subscriber's counter. The circuit arrangements of a localbattery system, in which metering at the exchange and at the subscriber's station can be carried out as described, are shown in Figs. 17 and 18. When a subscriber S, Fig. 18, calls, he completes a circuit at the exchange through a magnet A<3>, which then pulls over its armature G to close contacts at X<1>, G<1> in the path of the counting-current. The insertion of the answering-plug breaks this circuit but makes a new contact S', in the path of the counting- current. The insertion of the calling-plug completes the calling-circuit through one line of the subscriber S<b> and earth, and also a circuit through a magnet CK' which holds an armature G<b> in such a position that the counter B<1b> of the called subscriber is short-circuited. The calling-current also flows through a relay R<3>, Fig. 17, in the cord circuit, which completes a bridge BL, which shortcircuits the condensers in the cord circuit. If now the subscriber G<b> removes his instrument, a complete circuit including both subscribers' lines and the counters at the exchange and at his own station of the calling subscriber, is completed. This circuit may be traced from the battery CB, the armature G<b>, the contact S<1b>, the instruments of the called subscriber S<b>, the magnet CK<1>, the jack contact S', the calling-plug and the bridge circuit BL and through the calling-subscriber's circuits by a similar path, but this time including the exchange counter B', to the line C and back to the battery CB. The completion of this circuit energizes the magnet R' in the bridge circuit BL, and this circuit and the counting-current are thus immediately broken and the circuits are in order for speech transmission.