Abstract: A subscriber power supply which delivers sufficient power to a subscriber terminal load despite variations in load current due to changes in the number of channels in a telephone carrier system. The power supply also has a back-up unit which operates to deliver power to the load in the event that a fault occurs in the primary supply.

Abstract: An electronic hybrid having a two-wire port adapted to be connected to a two-wire line and separate unidirectional receive and transmit ports, means for coupling signals received at said two-wire port to said transmit port, and a circuit for converting single-end signals imposed on the receive port into differential signals for application to the two-wire port.

Abstract: A plural channel amplitude modulated station carrier telephone system having a special synchronous ring detector circuit located in a station or terminal at the subscriber's end of the transmission line for signaling an incoming call for the subscriber's telephone and a special channel loop test circuit also located in the station mentioned above and employing one of the signals used in the synchronous ring detecting operation to turn on a subscriber's transmitter circuit for effecting a channel loop test.

Abstract: A screw-in station protector assembly includes a carrier housing containing a shorting cage which is biased by a compression to urge the cage and gas tube arrester assembly outwardly. The gas tube assembly contained within the cage includes a two electrode gas tube and a sealed external back-up air gap protector. The screw-in-assembly is particularly adapted for retro-fitting/replacement of carbon block arresters without modification.

Abstract: A signal-amplifying telephone carrier repeater which is automatically self-adjusting for both cable length and cable gauge in a plural channel, frequency division multiplexed, amplitude modulated carrier system. Also disclosed herein is a subscriber power supply which delivers sufficient power to the subscriber terminal load despite variations in load current due to changes in the number of channels in the carrier system. The power supply also has a back-up unit which operates to deliver power to the load in the event that a fault occurs in the primary supply.

Abstract: A process for treating a cyanide and cyanate-containing aqueous influent such as a wastewater stream is provided. A two-stage method is included for destroying a cyanide-containing influent which comprises;(a) introducing said cyanide-containing influent into a first ozone-contacting zone;(b) contacting said influent in said first zone with a second ozone-containing gas, at least a portion of said second ozone-containing gas comprising a first ozone-depleted gas withdrawn from a second contact zone to form a first cyanide-depleted effluent and a second ozone-depleted gas;(c) introducing said first cyanide-depleted effluent into a second ozone-contacting zone;(d) contacting said effluent in said second zone with a first ozone-containing gas to form a second cyanide-depleted effluent and a first ozone-depleted gas;(e) withdrawing said first ozone-depleted gas from said second contact zone; and(f) withdrawing said second cyanide-depleted effluent from said second zone.

Abstract: An electronic hybrid for coupling a two-wire line to a four-wire line and having a two-wire port adapted to be connected to the two-wire line, separate receive and transmit ports adapted to be connected to said four-wire line, means for coupling signals received at said two-wire port to said tramsmit port, and a circuit connected to said receive and two-wire ports and including a pair of constant current sources for driving the two-wire line that is connected to said two-wire port in response to a signal imposed on said receive port.

Abstract: Gas filled surge arrester is equipped with a thermally responsive short circuit switch for overload protection and air gap shorting for back up overload protection. The switch and air gap device is disclosed in three orientations; namely, separate and external to the gas tube; unitized with the air gap interior to the switch; and unitized with the air gap exterior to the switch. The unitized arrangements have application in circuitry with gas tubes where back up air gap protection of the thermal switch is desired.

Abstract: A foam removal apparatus for a vessel which contains a liquid as well as foam bubbles has a cover inclined with respect to the horizontal, a screen, and a trough, the trough being located beneath at least a portion of the screen for removing foam pushed through said screen. The apparatus can be used in conjunction with any shaped vessel and requires no energy for foam removal. Either a rising liquid level in the vessel or a continuous generation of foam forces the foam against the inclined cover and through the screen which causes a substantial amount of foam bubbles to collapse and fall as liquid into the trough.

Abstract: A plural channel amplitude modulated station carrier telephone system and method wherein two a.c. signals are applied to modulate a called subscriber's channel carrier signal at a central office to signal an incoming call for the subscriber, wherein a phase locked loop is used at the subscriber terminal equipment to lock with one of the two a.c. signals following recovery of the two a.c. signals from the called subscriber's carrier signal, wherein the output of the phase locked loop is utilized to provide for the synchronous detection of the other of the two a.c. signals, and wherein a ring circuit responds to the synchronous detection of the other of the two a.c. signals to ring the called subscriber's telephone. Central office ringing signal frequency information is contained in the above-mentioned a.c. signal to develop a local ringing signal voltage having the same frequency as the central office ringing frequency for ringing the subscriber's telephone.

Abstract: Disclosed herein are surge arrester configurations employing non-metallic and preferably plastic fusible elements which normally insulate biased short circuiting members from shorting the surge arrester but which, in the event of certain forms of excessive overloads, fuse to thereby permit the shorting elements to short circuit the arrester gap. In addition, the embodiments include integral backup air gaps to provide additional backup protection covering certain gas tube failure modes. In the illustrated embodiments, the shorting elements each take the form of a conductive clip with one set of spring fingers in electrical contact with the line (end) electrode and another set urged in the direction of the ground electrode but separated therefrom by an annular plastic fusible sleeve coaxially coupled to the center body housing.

Abstract: A plural channel amplitude modulated frequency division multiplexed station carrier system wherein the receivers of the subscriber and central office channel terminal circuits are each equipped with a bandpass filter which is tuned to the carrier frequency to be received and with a circuit for synchronously detecting the carrier signal to which the bandpass filter is tuned. In the subscriber channel terminal circuits the bandpass filters are of the first order type, and in the central office channel terminal circuits the order of each bandpass filter is no greater than two.

Abstract: An apparatus for the treatment of purification of a fluid by treatment with a treating fluid in a flow pipe. The flow pipe has a flat plate orifice located therein, which orifice has an internal diameter of from about 0.7 to about 0.9 of the internal diameter of the pipe. A vena contracta portion is located in the flow pipe at a distance of from 0.25 to 0.5 pipe diameters downstream from said flat plate orifice. An injection nozzle for introducing the treating fluid into the flow pipe extends through the flat plate orifice with the tip of the injection nozzle being located in the vena contracta portion so that the fluid is thoroughly treated by the treating fluid.

Abstract: A three element gas filled tubular surge arrester is disclosed. The arrester has a hollow cylindrical mid-section or centerbody defining a first cylindrical electrode, and a pair of rod-shaped line electrodes extending inwardly into and along the axis of the centerbody from respective end caps to define respective annular gaps relative to the centerbody electrode as well as a gap between the opposed ends of the line electrodes. The end caps are electrically and mechanically connected to the line electrodes but insulated by annular insulator spacers from the centerbody. One of the line electrodes is partially hollow and apertured, and incorporates a pinch tube for exhaustion and subsequent filling of the tube interior with an ionizable gas.Incorporated in this known design is an annular sleeve which lines the centerbody and is coaxial relative to the rod electrodes. The sleeve, which is of metallic composition, functions to improve the overload handling capacity of the arrester.

Abstract: A three phase power ozonator system in which the head of an ozonator cell containing multiple cylindrical type elements is tri-partitioned to define three sectors in the cell each of which contains a portion of the total number of cylindrical type dielectric elements. The partitions are made of insulating material such as polyvinyl chloride. Each sector is distinct and each sector is adapted to be operated with single phase electrical power. As a result the ozonator cell as a whole is able to operate using three phase electrical power. This arrangement allows for the operation of the ozonator cell in a system having any number of other three phase electrically operated components of equal or smaller electrical load than the ozonator cell in such a way that a balanced electrical load is maintained throughout the system.

Abstract: A short circuit clip with legs for resiliently engaging a line and ground electrode of a gas tube arrester includes an air gap device at one set of legs. The air gap device includes a conductor member extending from the clip to contact an arrester electrode and insulated from the clip by a layer of insulation having a hole to form the gap. The air gap device may be releasably connected with the clip or permanently attached. In the former case, a ferrule housing, which acts as an electrode for the air gap, is fitted to the clip. In the latter, the conductor is a rivet which attaches the device to the clip. Non-metallic fusible elements are interposed between the clip legs and associate arrester electrode.

Abstract: The system disclosed transiently disconnects a subscriber's telephone equipment and network from the service provider (e.g. telephone company) network for a predetermined period of time in response to a remote switching pulse to facilitate the execution of diagnostic measurements without the necessity of visiting the subscriber's premises. The disconnect action is carried out by a two stage solid state circuit incorporating gate controlled devices such as SCRs together with RC networks whereby a capacitance is charged in response to the remotely originated switching pulse and then discharges to energize a switching relay and to maintain it energized for a predetermined period. In the energized state the switching relay isolates the subscriber network and its equipment from the telephone company network to permit the diagnostic measurements. The circuit design also provides improved noise suppression, as well as protection against spurious switching and certain overvoltage conditions.

Abstract: Disclosed herein is a three-element gas tube fail-safe station protector of known design modified to incorporate a back-up air gap system. To the ground terminal stud of the protector is added a lateral conductive member defining a pair of blade-shaped ground electrodes. To each of the line electrode terminal studs is added a conductive blade-shaped electrode which overlaps and is spaced from a respective one of the ground electrodes. The air gaps which are thus defined between ground and each line, i.e. paralleling the gas tube gaps, are encapsulated and dimensioned to provide back-up ionization in the event of a failure of the gas tube.

Abstract: A rotary distributor arm comprising improved distribution nozzles and flow control accomplished by a gradual taper of the arm itself is defined which ensures a uniform flow distribution across the full radius of the distributing medium so that uniformity and optimum economy and efficiency are achieved with respect to the trickling filter itself because a uniform fluid flow is distributed across the entire top surface thereof.