Abstract: A method and apparatus for arc welding particularly regarding a pulse arc welding machine comprising a welding power source having an output characteristic control circuit, an overload protection circuit, a driving circuit, and a main power circuit, and a wire feeding unit having a wire feeding control circuit, a motor driving circuit and a wire feed motor. The output characteristic control circuit comprises a welding arc autoregulating control system which provides the power source with a multi-segmental and moving output characteristic with varying slope, a circuit for connecting arbitrary number of output characteristic segments with arbitrary or varying slope, and a scanning circuit for obtaining the output characteristic segment with varying slope. A particular use of the control system is in an easy to operate autoregulating controlled GMA welding machine with one-knob control of wire feed rate without having to adjust the other welding parameters.

Abstract: A double-lobe liquid ring gas compressor includes a port member having two circumferentially spaced intake ports and two circumferentially spaced discharge ports. The intake ports are axially offset from the discharge ports. The intake ports are connected to a common intake passage in the port member, and the discharge ports are similarly connected to a common discharge passage in the port member. These passages respectively communicate with intake and discharge manifolds in a head member which can be identical to the head member of a single-lobe liquid ring vacuum pump.

Abstract: In liquid ring pumps having conical port members, cavitation and associated operating noise are reduced by providing a second subsidiary discharge port beyond the closing edge of the main discharge port in the direction of rotor rotation.

Abstract: A transducer system for a weighing scale having a flexure mode crystal resonator includes a parallelogram linkage for supporting the load platform of the scale, a mounting structure for mounting the crystal resonator between two pivotally connected mounting arms, and a coupling assembly for coupling force from the parallelogram linkage to one arm of the mounting structure.

Abstract: An electronic balance having a strain gauge transducer. The analog output signal of the transducer is processed digitally so that the displayed weight is based on several successive digitized analog signal samples. Various operating parameters (e.g., conversion factors for several different units of weight) are stored in a non-volatile memory so that the scale can perform various weighing functions. The scale has a parts counter mode of operation requiring re-taring of the parts container whenever the scale is recalibrated for a different individual part weight.

Abstract: In liquid ring pumps having conical port members, cavitation and associated operating noise are reduced by providing a second subsidiary discharge port beyond the closing edge of the main discharge port in the direction of rotor rotation.

Abstract: A liquid ring pump with a conical or cylindrical port member has a vent-recirculation port in the port member in addition to the conventional intake and discharge ports. The vent-recirculation port communicates with the compression zone of the pump and is connected to a reservoir of pumping liquid maintained in the discharge portion of the pump head. When the pump is operating at relatively low compression ratios, the vent-recirculation port acts as a vent to prevent overcompression of the gas in the pump. At relatively high compression ratios, the vent-recirculation port recirculates pumping liquid from the reservoir, thereby increasing the maximum attainable compression ratio.

Abstract: A system is described for control of sulfur oxides in emissions to the atmosphere from regenerators of cyclic Fluid Catalytic Cracking Units (FCC). By the disclosed system, hot regenerator flue gas is cooled, air (oxygen) is injected into the cooled flue gas unless oxygen is already present, and then the cooled flue gas is contacted with a solid particulate material which has the capability of associating with and binding sulfur oxides in the flue gas to form a stable solid material which is separated from the gases.

Abstract: A liquid ring pump having at least one vane disposed in the portion of the liquid ring between the outer periphery of the rotor and the inner periphery of the housing for controlling the flow of the adjacent liquid to reduce energy losses due to such factors as the curvature of the liquid flow and re-entry of the liquid into the rotor with velocity which does not match the velocity of the liquid already in the rotor.

Abstract: A liquid ring pump having at least two discharge port portions communicating respectively with relatively low and relatively high pressure portions of the compression zone in the pump, and a discharge chamber communicating with the discharge port portions for causing excess pumping liquid discharged from the discharge port to flow transversely over the discharge port portion communicating with the relatively low pressure portion of the compression zone.

Abstract: Systems for evacuating process fluids having condensable and incondensable components, especially those including corrosive constituents, include a condenser for condensing at least part of the condensable component and discharging the condensate from the system, a jet diffuser supplied with atmospheric air as a motivating fluid for diluting and increasing the pressure of the uncondensed portion of the process fluid, and a liquid ring suction pump for further increasing the pressure of the diluted uncondensed process fluid and discharging it from the system.