Abstract: A proportional controller controls the speed of an engine during start-up and warm-up periods by utilizing the properties of thermoexpansive and electroexpansive materials to regulate air flow to the engine in proportion to engine manifold vacuum, prevailing ambient temperature and a predetermined warm-up schedule.

Abstract: In a fuel management system for an internal combustion engine, a system utilizing a stoichiometric gas sensor in the exhaust gas system for supplying an electrical signal to an asymmetrical integrator which controls and maintains any desired air/fuel ratio to the engine. By means of the system, the air/fuel ratio may be maintained slightly richer than stoichiometric for optimum catalytic converter operation. For very lean air/fuel ratios, a delay circuit is used in the system to continue the time the fuel mixture is in a lean condition before the mixture is controllably changed to a rich mixture for sensing by the sensor.

Abstract: An arrangement is disclosed for providing trunk consultation in an electronic private automatic branch exchange which is built around a space divided solid state matrix. The trunk consultation arrangement is enabled by a hookswitch flash from a consulting PABX station connected to an established incoming or outgoing trunk call and directs the trunk junctor associated with that call to place the connected trunk on hold. While the connected trunk junctor is in a held status, the consulting PABX station is forwarded to a local junctor where the consulted trunk party is dialed. A connection between the consulting PABX station and the consulted trunk party is then established via a second trunk junctor. Further circuitry is provided in the trunk consultation arrangement to establish a three-way consultation between the consulting PABX station, the consulted trunk party, and the held trunk party.

Abstract: A loudspeaking telephone system including voice switching is disclosed. The system is bistably voice controlled by inversely regulating the impedances of variolossers in the transmit and receive channels respectively. Further provision is made for switching additional impedance in parallel with each variolosser control to provide for a loud and a soft receiving mode. Hysteresis is added to the bistable control by the summation of receive and transmit signals across a plurality of unequal impedances that form part of a novel input control means. Circuitry forming the input control means also includes noise guard means useful in discriminating between ambient noise signals and syllabic speech signals. The noise guard circuit discriminates between noise signals and speech signals by producing an output whose amplitude is substantially related to ambient noise conditions while the noise guard circuit generally is not responsive to rapidly fluctuating voice signals.

Abstract: A method and apparatus are disclosed for providing automatic toll ticketing in a common control telephone system. The method includes sequences which provide automatic ticketing for station-to-station sent paid local or tributary terminations with automatic or operator number identification. The apparatus includes an adapter circuit connected to the common control for directing the transfer of toll information from common registers to a toll buffer. An automatic recorder is controlled by the toll buffer and a plurality of recording trunks to receive charge information and provide a permanent record of the toll charges for the common control system.

Abstract: A tie trunk control arrangement is disclosed for providing tie trunk connections in an electronic private automatic branch exchange which is built around a space divided solid state matrix. Each tie trunk has an associated tie trunk junctor dedicated thereto which may be connected to local stations by the PABX system in a manner similar to other trunk junctors. For incoming tie trunk connections an attendant extension or station attendant extension is used for providing connections to other PABX stations and trunk circuits. Common circuitry used for trunk transfer and trunk consultation may be used by the station attendant to extend the tie trunks to the PABX stations and the outgoing trunk junctors. Further circuitry is provided by the tie trunk control arrangement to allow a tie trunk and a central office trunk to be tandemed in the system or to allow two tie trunks to remain tandemed in the system without attendant supervision.

Abstract: A system for "capturing" charge within the structure of an electrophotographic imaging member in the imagewise exposed areas and thereby creating an electrostatic latent image in the imagewise exposed areas which in preferred embodiments of discrete non-touching particles of electrically photosensitive material stands up better against time, heat and light. Said imaging member is comprised of an insulating layer and electrically porous, mechanically discontinuous electrically photosensitive layer contacting said insulating layer. The process includes (1) charging, (2) imagewise exposure, and (3) promoting the dissipation of charge from the areas which are relatively nonexposed compared to the exposed areas, leaving behind an electrostatic latent image in the imagewise exposed areas. The electrostatic image thus created may be used or developed by any suitable technique other than by causing imagewise migration of said electrically photosensitive material.

Abstract: An automatic number identification system in a tributary office having simultaneous dual operation for high traffic capacity. A pair of identifier units applying identification signals via the sleeve wire associated with the calling stations to a common matrix or directory number network.

Abstract: There is disclosed a device and method for measuring the angle of repose of a granular material. The device is composed of a rectangular body having an open ended partition dividing the body into two cells. A sample of granular material is placed in one cell and allowed to flow from one cell into the other cell under the influence of gravity. Both the static and dynamic angle of repose can be determined.

Abstract: A circuit is disclosed for providing trunk transfer in an electronic private automatic branch exchange which is built around a space divided solid state matrix. The trunk transfer circuit is enabled by a hookswitch flash from a transferring PABX station connected to an established incoming or outgoing trunk call and directs the trunk junctor associated with that call to place the connected trunk on hold. While the connected trunk junctor is in a held status, the transferring PABX station is forwarded to a local junctor by the trunk transfer circuit and a connection is established from the local junctor to a transferee PABX station. The trunk transfer circuit then completes the transfer by establishing a connection between the held trunk and the transferee PABX station via the held trunk junctor.

Abstract: An interface circuit is disclosed for ground starting central office trunks connected via a station carrier system to a plurality of PBX subscriber terminals. The interface circuit extends ground start signals between central office sensing means and subscriber terminal control means over the high frequency transmission cable of a multiple-channel station carrier system. Associated with each of the plurality of multiple-channel units that interface central office terminal trunks to the carrier system are ground start sensing means multiply connected to ground start common circuitry. The ground start common circuit interprets signals from the ground start sensing means as to which of the voice frequency connecting pairs indicates a signal ground and subsequently forwards this information in the form of modulated intelligence on a discrete carrier over the high frequency transmission highway.