![]() ![]() Each key is connected by wire with its respective lettered magnet at the centraloffice, and when pressed an electrical circuit is established, it being understood that both ends of the wire are grounded or connected with a return-tap, italso being understood that a battery is used to generate the electricity and may be located at the sub-station between the keys and the ground. At each sub-station there is a set of keys marked, respectively, G, H, I, and P. A set of magnets K K K K are also located in suitable positions, that when energized their respective levers P serve to release the pawls from their engagement with the ratchet-teeth and allow the circuitclosing needle 0 O to assume the initial position by the aid of gravity and the spring S. The magnets K K K arelocated in suitable positions that when energized by the manipulation of certain keys at the sub-station, operate their'respective levers. From each phonic wire and attached thereto wire terminals, connectives, or legs extend to the inside of each cylinder, there being as many connectives attached to each phonic wire as there are sub-stations. The abovementioned phonic wires trend within the central oifice in close proximity to each cylinder. At the central office are arranged in methodical order as many switch-cylinders, with their attendant mechanisms, as there are sub-stations. At the sub-stations are the appliances which are used to transmit and receive communication, as telephones and keys. ![]() The same general plan is adopted as in the systems now in use, in that of having a principal or central station, (central ofiice,) and a number of sub-stations, the said sub-stations being placed in electrical connection with each other at the central ofiice by and through line-wires, which line-wires, for the sake of brevity, will be designated phonic wires, (introducing the ancient obsolete fornn) but differ in that of having, in addition to the said phonic wires, a series of wires (one or more) to operate the hereinafter-described mechanisms located at the central office. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.) Expired - Lifetime Application number Publication date Application granted granted Critical Publication of US447918A publication Critical patent/US447918A/en Anticipated expiration legal-status Critical Status Expired - Lifetime legal-status Critical Current Links US447918A - Automatic telephone-exchange - Google Patents US447918A - Automatic telephone-exchange - Google Patents Automatic telephone-exchange Download PDF Info Publication number US447918A US447918A US447918DA US447918A US 447918 A US447918 A US 447918A US 447918D A US447918D A US 447918DA US 447918 A US447918 A US 447918A Authority US United States Prior art keywords rod cylinder wires magnets levers Prior art date Legal status (The legal status is an assumption and is not a legal conclusion.
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