Abstract: The disclosure relates to an improved recuperative heat exchanger for a turbine engine. Heat exchanger modules have discrete passages therein for the relatively high pressure compressor discharge air and relative low pressure exhaust gases. A continuous seal is provided at each end of the exhaust passages in the heat exchanger that is expandable into positive engagement with the heat exchange module.

Abstract: A cooling system 44 for an electrical generator 42 is disclosed. The cooling system rejects excess heat to the engine fuel through a primary heat exchanger 46 and at low fuel flow rates, supplementarily rejects heat to fan air at a secondary heat exchanger 48 located remotely from the fan duct 30. In one embodiment, the secondary heat exchanger is disposed in a nacelle fan compartment 14. In another embodiment, the secondary heat exchanger is disposed in a nacelle core compartment 16.

Abstract: A hydraulic drive apparatus for a wellhead pump jack which utilizes oppositely driven single-acting hydraulic cylinders as actuated by a variable volume pump having flow direction and flow volume controlled by a servo linkage and control lever. The linkage transmits oscillatory sine function motion of the walking beam for movement of the control lever as intermediate biasing force prevents nulling of the system.

Abstract: A gas compressor for compressing working gas of a hot gas engine is using the oscillating pressure of a working gas charge for acting upon the large diameter piston of a differential piston the small diameter part of which is used as compressor piston. One side of the large diameter piston is directly connected to a variable volume chamber of the hot gas engine while the other side of the same piston is alternatively connectable either to a minimum or a maximum gas pressure source.

Abstract: A pedal-operated booster incorporates a valve mechanism for controlling pressurization of a boost chamber. The valve mechanism comprises a pedal-operated piston and a pressure-responsive valve spool which is coupled to the piston for limited relative movement in a longitudinal direction within a working chamber in the piston. The spool is movable with the piston in an initial brake-applying direction in which the spool is operative to isolate the boost chamber from an exhaust port and the piston is operative to place an inlet port in communication with the working chamber. This causes the spool to move relatively away from the piston in response to pressure fluid in the working chamber which is admitted to the boost chamber.

Abstract: A master cylinder includes a housing (12) with a bore (14) receiving a pair of pistons (32, 34). A bearing (50) extends from the housing (12) to one of the pistons (32) to define a passage (65) communicating fluid to a pressure chamber (40). The bearing (50), the passage (65) and the pressure chamber (40) extend outwardly of the housing bore (14) to permit the length of the housing to be reduced.

Abstract: An improved method and apparatus for a compression release engine retarder is disclosed. The method and apparatus are used in conjuction with a supercharged internal combustion engine fitted with a compression release engine retarder and a supercharger employing a divided volute exhaust gas turbine. A diverter valve is located between the exhaust manifold of the engine and the exhaust gas turbine. Upon actuation of the compression release engine retarder, all of the exhaust gas (or air) passing through the exhaust manifold is diverted to the portion of the divided volute of the turbine which is closest to the turbine wheel flange and, within that portion to the divided volute, to the region closest to the center of rotation of the turbine wheel.

Abstract: Outlet and inlet conduits of an internal combustion engine are united in, and carry a housing enclosing a rotor spool having one turbine and one compressor wheel. A cavity in the housing, the longitudinal axis of which is substantially parallel to a middle plane through the row of engine cylinders is adapted to receive the casing of the turbocharger, and may be designed in such a manner that the casing may be slid into the housing in the axial directions, without the housing having to be removed from the engine. Alternatively, the outlet and the inlet conduits may each, per se, be collected and form one half of the housing. The halves are brought together over the rotor spool, from both ends thereof. Resilient sealing members are preferably fitted between the two halves of the housing. A second exhaust gas turbine may be connected to the exhaust conduit from the supercharger, and may be adapted to drive at the power take-off shaft of the engine, or to drive some auxiliary.

Abstract: An exhaust gas recirculation (EGR) system for a diesel engine comprising an EGR control valve for regulating the flow of exhaust gases to be recirculated from an engine exhaust system back to an engine air intake system. When the exhaust gas recirculation is to be interrupted, the EGR control valve is closed a predetermined time after the opening of a throttle valve used in the air intake system for regulating the flow of air towards the engine. For this purpose, delay valves are utilized in association with the throttle valve and the EGR control valve.

Abstract: The invention discloses an apparatus for adjusting or actuating an air throttle valve positioned in the intake manifold of an internal combustion engine which is supplied by air under pressure. The air throttle valve is held in a closed position by a spring when the engine is in the cold starting phase. Air is supplied to the engine through a by-pass valve when the air throttle valve is closed. The air throttle valve is opened against the force of the spring in response to a predetermined pressure or vacuum in the intake manifold at the end of the cold starting phase. The air throttle valve is held in an open position by an electro-magnetic structure which is effective when an ignition circuit of the vehicle is energized or by a detent structure which is effective when the engine or exhaust temperatures are at predetermined levels.

Abstract: A method of and apparatus for recovering exhaust gas from a boiler 2 of a thermal electric power generating device 1 are disclosed. The exhaust gas from the boiler 2 is fed through a conduit 30 to a preheat section 21 of a powder raw material treating device 20. The heat of the exhaust gas is recovered as a heat source for preheating the powder raw material. The ash contained in the exhaust gas is recovered as part of the powder raw material at the preheat section. The sulfur oxides in the exhaust gas react with the desulfurizing component of the powder raw material at the preheat section, and its reaction product is recovered as part of the powder raw material.

Abstract: An evaporator for producing wet steam in a cogeneration plant wherein the evaporator is a multiple pass unit having continuous in-tube flow paths from inlet to outlet. The evaporator is a shell and tube type with the clean steam on the shell side and water in the tubes. The evaporator is particularly useful in a cogeneration plant used in a secondary recovery process using contaminated wet steam.

Abstract: A steam pressure rate limiter for a steam turbine system reduces the setting of a steam control valve when a rate of decrease in steam pressure is detected which exceeds a threshold value of rate of decrease. A floor on control of the steam control valve is enforced in order to maintain a predetermined amount of steam flow to the turbine thereby to provide for cooling of the turbine.

Abstract: An overspeed detection circuit for producing an overspeed trip signal for shutting off a supply of motive fluid to a prime mover upon the prime mover exceeding an overspeed trip limit includes a differentiating circuit effective to differentiate a speed signal to produce an acceleration signal related to the rate of change in the speed signal. The acceleration signal is summed with the speed signal to produce an effective speed signal which anticipates the crossing of an overspeed threshold when a fault permits a constant speed increase to occur but does not force the summed signal to cross the overspeed threshold when normal speed control is exercised.

Abstract: A swirler for use in combustion chambers in which the vanes of the swirler are partially unshrouded to improve the mixing of fuel and air.

Abstract: For the controlled cooling of specimens which are at least partially of liquid form, especially biological specimens, it is important that crystallization at the freezing point takes place locally, without supercooling, and preferably with absorption of the latent heat of fusion. At a temperature which is a predetermined amount above a given critical temperature for the specimen, e.g. its freezing point, a Peltier effect module is energized to effect supplementary cooling at a local area, for example one end of the specimen. The Peltier effect module and the specimen in its container supported in a sample holder are relatively movable. Preferably, the module is displaced, this being initiated by the insertion and removal of the sample holder, preferably by direct mechanical engagement.

Abstract: A cooling system is provided for organs during transplant surgery. A disposable receptacle (10) has a sterilizable interior and is formed of a material that is sufficiently rigid to maintain its shape normally without collapsing but sufficiently flexible to be squeezable manually. A disposable flexible container (16) is located inside the receptacle. The flexible container (16) contains a liquid solution that is adapted to be chilled in a freezer. The flexible container (16) and its contents are sterilizable and useful for providing cooling for organs during surgical transplants. The disposable receptacle (10) has a peelable lid (14) that is sealed to a tray portion (12) to enable the sterilizable container (16) to be aseptically removed from the receptacle (10).

Abstract: There is provided a method of assembling an anti-sweat heater in a refrigerator cabinet that includes forming the outer case of the cabinet with a sidewall and front face having a right angle corner therebetween and a flange spaced from the corner and inwardly turned from the front face with a depending lip extending towards and spaced from the cabinet sidewall. A heater retainer member is formed and has a portion thereof in cross section view with a front end shaped to receive the heater, a straight center section and two flexible wings, one on each side of the center section and diverging from the center section away from the front end, and also a rear end. The anti-sweat heater is placed in the front end of the retainer member and the heater and front end and center section including the wings of the retainer member are inserted through the space between the depending lip of the flange and the cabinet sidewall.

Abstract: In a heat pump system for domestic hot water, a compressor section 18 provides working fluid at a multiplicity of pressures. Multiple condensers 12, 14 are arranged so that higher pressure working fluid is in heat exchange relationship with higher temperature water. Upon leaving the condensers 12, 14, working fluid is independently expanded and then combined, and it runs through a single evaporator 31 before returning to the compressor 18. The water may be circulated past an external condenser 12, 14 or the condensers 46, 48 may be immersed in a hot water storage tank 38.

Abstract: In the operation of a refrigeration system comprising a compressor, a condensor, an expansion valve and an evaporator which form a circulation circuit containing NH.sub.3 refrigerant as a first medium, the compressor being lubricated by a second medium, oil, part of the oil quantity being continuously discharged from the compressor together with compressed NH.sub.3 -gas into the circulation circuit for recirculation of oil to the compressor, continuously or batchwise, from the low pressure region of the circulation circuit, that is, the region located between the expansion valve and the compressor, the part of the oil transferred to the low pressure region (5, 6, 8, 9, 10, 11) of the circulation circuit is contacted with a third medium, added to the circulation circuit and which is substantially insoluble in liquid NH.sub.

Abstract: A cooling chamber for drawing down freshly picked and field warmed unitized (for example in cartons stacked on pallets) vegetables, such as cauliflower, is disclosed. Freshly picked cauliflower is placed in rectangular cartons in side-by-side stacks of four extending approximately fourteen cartons high. A group of individual pallets (typically 10 to 12) so loaded are typically placed in the field on a transport chassis and brought to the vicinity of the cooling chamber where they are simultaneously unloaded by a multi-pallet forklift truck. The chamber receives multi-pallet load through an open door and is inserted into the chamber. This chamber has a rear seal which conforms to the periphery of the load and defines in the interstitial volume between the chamber backwall and load a warm air return plenum to forced draft refrigeration apparatus. The load when placed within the chamber has a door closed to form an air-tight seal.

Abstract: A temperature and humidity control system including a heat pump including a compressor, an evaporator and a condenser; vaporizable refrigerant contained in a closed circuit communicating with the compressor, evaporator and condenser, a regeneratable dessicant material, valve and conduit apparatus for selectably directing air into and communicating with the condenser, evaporator and dessicant material and including first apparatus operable in a cooling/dehumidifying mode for supplying air first to the evaporator and from the evaporator to the dessicant material, and from the dessicant material to a volume sought to be conditioned and second apparatus operable in a heating/humidifying mode for supplying air first to the condenser for heating of the air and from the condenser to the dessicant material for humidifying of the air to a volume sought to be conditioned.

Abstract: An ambient air assisted cooling system comprising: vapor-compression refrigeration means; air-cooled heat exchanger means; and means responsive to the temperature of the ambient air for advancing the matter to be cooled through said refrigeration means and/or said heat exchanger means. Said means for advancing said matter preferably comprises microprocessor means.

Abstract: Method and apparatus for producing frozen product characterized by flowing liquid substantially uniformly over a substantially vertically oriented freezing mold; supplying liquid refrigerant to a conductive surface in the freezing mold for freezing the liquid into predetermined shapes; collecting the excess liquid into a reservoir and circulating the excess liquid back over the top of the freezing mold, the liquid being at its freezing point; stopping the circulation of the liquid over the freezing mold and initiating a dump mode in which the freezing mold is heated and tilted to dump the frozen product into a receiving bin; detecting when the receiving bin has sufficient frozen product therein and stopping the production of more frozen product until some has been used; repeating the cycle orienting the freezing mold substantially vertically and starting the refrigeration equipment to freeze the product and repeat the cycle.

Abstract: Method and apparatus are disclosed wherein a circuit for detecting the phase angle of a motor is disclosed. This circuit utilizes zero crossing detectors to compare the voltage and current signals such that a digital signal indicating the value of the phase angle by the duration of the signal is generated. Additionally, a method and apparatus for comparing the phase angle to the reference phase angle value is disclosed. Means for updating the reference value and for comparing the detected value to the reference value to determine appropriate defrost initiation time are additionally disclosed.

Abstract: A heat pump for heating and/or refrigeration comprises a combination of a working fluid circuit including a steam ejector or a heat operated piston heat pump device and absorption heat pump section. The first circuit is energized with relatively high-grade, input heat and produces lower-grade output heat. The output heat energizes the absorption heat pump section. The combination provides for efficient use of the available energy (exergy) of the input heat.

Abstract: A refrigerating apparatus comprises two refrigerant circuits connected in a parallel fashion which include a common condenser. An evaporating temperature in an evaporator of one refrigerant circuit is set to a relatively high temperature compared with that of an evaporator of the other refrigerant circuit, so that a two-temperature evaporation type refrigerating apparatus is formed and a compressor of one refrigerant circuit can be intermittently driven for each predetermined time period in a forced manner. In a defrosting mode, the condenser is made to operate as an evaporator, whereby the evaporator included in the other refrigerant circuit is defrosted.

Abstract: A system for optimizing the control of the water temperature within a cooling tower is disclosed. The temperature and the relative humidity of the air outside the cooling tower are measured and are selectively utilized as inputs to a plurality of modules containing function blocks in a logic arrangement. The function blocks produce an output signal indicative of the wet bulb temperature of the outside air which is compared to the cooling tower water temperature causing the speed of the cooling tower fans to be adjusted in response to the temperature difference therebetween.

Abstract: A solar powered refrigeration unit includes an array of solar cells connected in series-parallel configuration to produce more than 12 volts dc. One side of the array is grounded, and the positive output is connected through a diode to the positive terminal of a storage battery. The diode is configured to prevent the battery discharging through the solar cell array. The array is also connectd to one side of a back to back diode arrangement, the junction of which is connected through a thermocouple to a voltage controlled relay. The refrigeration unit compressor is connected to the relay, which is switched on by the thermocouple. The back to back diode arrangement permits the greater voltage of the solar cell array or the storage battery to power the compressor.

Abstract: In a refrigeration system including a refrigerating coil, for circulating refrigerant to cool the space ambient thereto, and a defrost pan beneath the coil having a liquid drain outlet so that ice formed thereon by water condensing from the space drops therefrom to the pan, the improvement which comprises a heater pad mounted in the defrost pan to receive ice dropping from the coil, the heater pad comprising a generally flat array of laterally spaced elongated members of good heat conductivity having flat lower surfaces in contact with the defrost pan and flat upper surfaces jointly defining a longitudinally slotted substantially continuous ice receiving plane, the surfaces being in heat conductive relation with central fluid conducting bores, and the pad further comprising conduits for conducting heated fluid to and from the bores in a desired flow pattern to supply heat for conduction to the surfaces.

Abstract: A reversible refrigerant heat pump system wherein a pair of volumes are provided, each being adapted to function alternatively as an oil separator when in the flow path of high pressure discharge refrigerant gas from the compressor and as an accumulator when in the flow path of low pressure suction refrigerant gas returning to the compressor.

Abstract: A system for extracting heat from low temperature water includes a source of water at a temperature between approximately 0.degree. C. and 10.degree. C. and a heat pump removing heat from the water and transporting it for transfer to an external heating circuit. The heat pump has a closed circuit containing a heat transport fluid, a condenser, and an evaporator. The water, acting as a heat source, is fed into a vacuum vessel and subjected to triple-point conditions thereby concomitantly forming water vapor and a water/ice crystal suspension. The evaporator is disposed in the vacuum vessel out of direct contact with the water/ice crystal suspension for absorbing heat from the evaporated water vapor.

Abstract: An automatic plate freezer comprises a plurality of freezer plates which rest on a lower support connected by ties to an upper support. Each plate rests on the plate below via adjustable spacers and the upper support may be raised and lowered by jacks. In use, product to be frozen is loaded on the plate located at a loading level determined by sensors and the spacers associated with that plate are set to a value appropriate to the product in question. The jacks are then extended to lift the stack of plates until the plate just loaded is engaged by latches. The stack is then lowered, and the latches support all plates at and above the level of the latches. Lowering of the remaining plates continues until the sensors detect that the plate below that just loaded is at the loading level whereupon the cycle repeats.

Abstract: A passive transportable cooling unit for storing vials of allergenic extracts or the like has a vial tray and supporting gel plate filled with a freezable liquid gel, and an insulating carrier having an inner compartment which snugly holds the gel plate and vial tray. The insulated carrier has handle recesses for easy removal of the gel plate and vial tray, and the carrier is expandable for uses other than vial tray storage by means of an extension collar insertable between the carrier box and carrier lid.

Abstract: A refrigerant fluid accumulator and charging apparatus for vapor-compression refrigeration systems comprising a pressure vessel having an interior liquid/vapor separation chamber, a liquid reservoir, a refrigerant inlet conduit, a primary refrigerant vapor outlet conduit and a secondary refrigerant outlet conduit in communication with a sump portion of the reservoir and with the primary outlet conduit. The secondary refrigerant outlet conduit includes a sight glass for observation of the flow of fluid from the sump into the compressor suction line. Refrigeration systems may be accurately charged with refrigerant fluid by operating the system at design load conditions with the accumulator and charging apparatus interposed in the refrigerant circuit between the evaporator and the compressor and by venting refrigerant fluid from the system until the flow of fluid through the secondary outlet conduit changes from liquid or mixed phase to substantially the vapor phase.

Abstract: An accumulator for an air conditioning system having a compressor, a condenser and an evaporator wherein the accumulator receives refrigerant from the evaporator at a location near an upper wall thereof, said accumulator including a domed baffle plate in its interior adjacent the accumulator inlet opening whereby liquid portions of the refrigerant are dispersed to the sides of the accumulator allowing the gaseous components of the refrigerant to accumulate in the upper regions of the accumulator adjacent the inlet opening of an outlet tube that extends vertically through the accumulator.

Abstract: An infra-red radiation detector comprises an envelope in the form of a dewar (1,2) in which a vacuum space (12) is present between an outer wall (2) and inner wall (1) cooled by a cooling element (20). Gas molecules are gettered from the vacuum space (12) by at least one shaped molecular-sorbent porous body (10,10') having a major surface which fits onto and is bonded to a cooled surface (e.g. of a radiation shield 8) associated with the cooled inner wall (1). The shaped getter body (10,10') is secured (e.g. by epoxy adhesive) at its major surface to this cooled surface in a heat-exchange relationship so as to be cooled by the cooling element (20) during operation of the detector. The shaped getter body (10,10') is preferably a moulded annulus of synthetic zeolite material.

Abstract: A knitting-transfer cam unit for V-bed flat knitting machines wherein needle butts of the needle bodies of slider needles are selectively lowerable in the needle channels of the needle beds by means of a needle selection device, and wherein the slider needles have sliders provided with slider butts and arranged for the transfer of stitches, comprises stationary and movable cam elements for engagement with the needle butts and the slider butts, and also comprises pressure cam elements.

Abstract: A clothes washing machine wherein the clothes receiving basket is driven through a speed reduction transmission by an electronically commutated motor operable unidirectionally in one mode for rotating the basket to effect a spin extraction cycle, and in a second mode motor rotation is cyclically reversed to cause oscillation of the basket during the washing operation. The speed reduction transmission is adapted to counteract the inertia of the basket generated by the high speed extraction cycle to provide a secondary braking action of the basket which supplements the dynamic braking capacity of the motor.

Abstract: A liquid flow type fabric treating apparatus having an annular fabric transfer passage composed of a transfer pipe and a stagnant cell connected to the transfer pipe, a first treating liquid jetting portion and a second treating liquid jetting portion; and at least one circulation pump for forcibly supplying the treating liquid from the stagnant cell to the liquid jetting portions and to circulate the treating liquid. The transfer pipe is provided at the lower stage of the stagnant cell so that the shifting of the fabric is made smoothly. A ramp portion for raising the fabric is provided at the outlet portion of the stagnant cell. The upper end portion of the ramp portion constitutes an inlet/outlet for the fabric. A fabric guide pipe is detachably secured to the inlet/outlet to form the transfer passage after the feed of the fabric into and out of the apparatus.

Abstract: The invention relates to a machine for chamfering pieces of hide, leather and synthetic materials of small thickness, in which all the operating machine members, and particularly the rotary cup-shaped blade, the feed roller for feeding the piece to be chamfered and the grinder to sharpen the cup-shaped blade are driven by independent power units. Said machine is also provided with means for the non volatile storage of working programs and for the automatic execution of diversified operating phases according to said programs, with the possibility of interrupting the program, enabling the manual operation of the operating members, and of restoring it after the manual operation.

Abstract: A lock housing and lock assembly unit for use with electric and gas fuel meter enclosures and the like is disclosed, including a lock plunger for mating with a locking stud and biasing means for urging the plunger into the lock position. The plunger and biasing means are captured within the lock housing by a cap which is press fit or otherwise permanently installed in the housing or made of part thereof. Temporary detent means may be provided to position the plunger in the open position prior to installation. A key is inserted through a key hole in the cap and in a socket in the plunger to withdraw the plunger to the open position within the housing. The invention lends itself to various plunger-stud mating designs and is adaptable to lock-key surface mating for selective key operation.

Abstract: A multistation lock including: a housing; a plug rotatable in the housing between a lock position and first and second stations; a keyway in the plug; locking tumbler means for coupling the plug and housing and being biased into a locking position and being movable to a shear position by a proper key in the keyway; and a code track in the housing, the track having a different code segment for each station for engaging a code section of a key shoulder, including a first code segment for the first station for enabling a first key having a code section receivable by the first code segment to move between the lock position and the first station, and a second code segment for the second station for enabling a second key having a code section receivable by the second code segment to move between the lock position and the second station.

Abstract: A holder for keys and the like comprising a pair of plates which are disposed in laterally slidable abutting relation and which have ring portions which define normally aligned openings on the plates. Passages which extend through generally longitudinal sides of the ring portions are normally aligned with and blocked by the ring portions of the opposite plates. The plates are relatively slidable to move the passages outwardly relative to the opposite plates so that the terminal ends of the ring portions adjacent the passages are accessible to receive a key or the like whereupon the key may be secured on the holder by sliding it between the two overlapping ring portions to the opposite end of the ring portion on which the key is mounted, and then returning the plates to their normal aligned positions.

Abstract: A flat blank of a metal which becomes superplastic at elevated temperatures is transformed into a part of the desired configuration in an apparatus that is utilized in connection with a hydraulic press, the apparatus having a lower section that is mounted on the press bed and an upper section that moves with the press ram. The lower section includes a forming tool having a contoured surface, the configuration of which corresponds to that which is to be imparted to the blank, and a cooling passage that surrounds the tool. The blank is positioned over the tool and cooling passage of the lower section. The upper section includes a chamber enclosed by walls and a bulkhead, another cooling passage at the lower end of the chamber walls, an infrared emitter within the chamber, and infrared optical sensors that are located outside of the chamber but view the blank through tubes that extend through the bulkhead and the emitter.

Abstract: The spring guide rail has several centering fingers and a bottom rail and is made out of a one-piece sheet metal strip into which substantially rectangular recesses are punched so that a ladder-type structure is formed with a pair of longitudinal bars being interconnected by cross bars. By repeated bending operations around given longitudinal axes the two parts of the bottom rail are formed by the longitudinal bars and the centering fingers are formed by the cross bars. Between the sections of the cross bars folded to face each other there is a space and in the bottom rail area projections are arranged which ensure the spacing between the opposite parts of the bottom rail. Thus, a simple and stable spring guide rail with a safe guidance is provided for the vane lifting springs.

Abstract: An instrument for bending and/or contouring a rod. The device has a fulcrum for bending which has a plurality of separate bending surfaces, each of which can be rotated into operating position to accommodate different sizes of rods or to provide for different severities of bend.

Abstract: A manipulator having at least two segments, rotatable with respect to each other, measures the angle formed therebetween and is self calibrating to insure the accuracy of the measurement. An electrical resolver is employed, with its rotor attached to one of the segments and stator attached to the other, with the rotor and stator slotted, in registration, at a relative position indicating electrical zero. Each segment has a pin formed on it positioned to engage the slots in the rotor and stator at a mechanical zero degrees output, insuring a zero degrees mechanical output for zero volts electrical output.

Abstract: A calibrating gas generator comprises two series connected solution tanks filled with an aqueous ethanol solution which are connected together so that a pump may direct air so that it successively bubbles through the ethanol solution in each tank and exit through a test nozzle connected to the last tank. Means are provided for maintaining a temperature in the first tank of 37.degree. C. and in the second solution tank of 34.degree. C. In accordance with the method of the invention, the testing reliability of the calibrating gas is extended by directing a gas such as air so that it successively bubbles through ethanol solutions in first and second tanks and by maintaining the solution in the first tank at 37.degree. C. and the solution in the second tank at 34.degree. C.

Abstract: The invention relates to improved methods of proving the calibration of meters, such as oil and water meters used in measuring fluid output of a producing oil well prior to the fluid reaching a stock tank. The method generally involves connecting a prover vessel, having an accurate volume reading sight glass, downstream of the meter to be tested, introducing a first volume of fluid into the prover vessel, degassing the fluid and pressurizing the vessel so as to establish a baseline reading. A preselected volume of fluid as registered by the meter is then introduced into the vessel, degassing and pressurizing are repeated and a second volume reading is obtained. The volume represented by the difference between the second and first volumes read at the prover vessel is divided by the volume registered by the meter to obtain a factor by which a meter reading may be multiplied to derive the true volume of fluid passing thereby. The volumes recorded may be temperature corrected to 15.degree. C.