Abstract: A method and an apparatus are disclosed for the harvesting of corn or other granular fruits, particularly embodied as a front-mounted unit for a reaper, in which the plant stems are drawn through a picking aperture and a separation of the fruit from the plant is characterized in that the plant is grasped only on one side and is drawn through the picking aperture.

Abstract: A hold down for retention of reciprocable sickles of cutter assemblies is characterized by its inflexibility and provision of adjustability in relation to the cutter bar such as to preclude undue movement of the sickle sections away from their normal scissors-like cutting positions in cooperation with the sickle guards on the cutter bar. A strong, massive hold down body permits minimum running clearance of the sickle beneath wear pads on forwardly extending fingers integral with the body. After adjustment of a extensible bolt and nut assembly between the hold down and the cutter bar and clamping of the hold down to the cutter bar, essentially trouble-free use can be expected without undue clogging or failure to easily cut even the toughest of grasses, weeds, and crops generally.

Abstract: A method for harvesting cucumbers comprising forming a series of parallel trenches in a field while planting cucumber seeds in a line parallel to the trenches and spaced equidistantly from adjacent trenches, the trenches being spaced apart a distance equal to the track of a tractor to be used for harvesting the cucumbers, and when the cucumbers have grown to maturity, harvesting the cucumbers with a harvester having spaced apart cucumber pick-up heads which are guided along either side of a row of cucumber vines while mounted on a tractor whose wheels are being guided by the parallel trenches.

Abstract: The separating head of the device contains a frame (10) in which a feed bush (12) for the twisting column (11) has been inserted at the top. Underneath this bush (12) there are the first arms (28) of double-armed levers (20, 21), which levers are components of a regulating facility which also includes a damping facility (30, 31) which acts on the second arms (29) of the levers (20, 21). The threads (16, 17) kept apart by the said first arms (28) loop around conical rollers (34, 35) of an equalizing roller (32), and then pass through a hollow shaft (2) out of the separating head (1). The other end of this shaft (2), on top of which the separating head sits tight, can be driven by means of a motor (7) via toothed wheels (5, 6).

Abstract: Method of and apparatus for spinning yarns from staple fibers in an air vortex in a stationary spinning tube axially coupled by one of its ends to a stationary air chamber, and by its other end to a sub-atmospheric pressure source. A flow of discrete fibers is supplied into the air chamber onto the wall of an air vortex which entrains, doubles and densifies the fibers before they are taken onto an open end of yarn which is given an additional twist while being withdrawn in the region between the air chamber and a take-off device. A fiber supply duct which opens into the air chamber is oriented toward the wall of the air vortex, an additional twisting device being provided between said twisting device and said air chamber.

Abstract: A guard is provided for a take-up shaft of an open-end yarn spinning machine. The shaft rotates about a first axis and cooperates with a cot (a small rubber wheel) which is rotatable about a second axis parallel to the first axis. The guard comprises a tubular body member, preferably circular in cross-section, having a central axis and first and second ends spaced from each other along the central axis. A slot is formed in the body, and the body surrounds the shaft. The body is concentric with the shaft and the slot is disposed beneath the shaft. A cut-out is formed adjacent, but spaced from, the first end of the shaft, and the cot operatively engages the shaft through the cut-out. The slot and cut-out preferably interconnect. A mounting bracket is joined to the body member at the second end of the body member preferably comprises a Y-shaped bracket having a stem integral with the body member and branches with openings for receipt of fasteners.

Abstract: An internal combustion engine has separate compression and expansion cylinders which are closed by a rotary valve structure. The rotary valve structure controls intake to the compression cylinder, transfer of compressed gas from the compression cylinder to a combustion chamber, transfer of combustion products from the combustion chamber to the expansion cylinder and exhaust of gases from the expansion cylinder. The valve structure is a one-piece rotationally symmetric unit which is synchronized with movement of piston assemblies carried in the compression cylinder and expansion cylinder, respectively. To maximize compression, the piston face is shaped to conform with rotationally symmetric sides of the valve structure. And to expand the combustion products to near ambient pressure, the expansion cylinder and cooperating piston assembly have a larger volume than the compression cylinder and cooperating compression piston assembly.

Abstract: A turbine engine for powering aircraft, land vehicles and the like having a stationary member inclusive of casing portions defining a plurality of radially extending, spaced combustion chambers. A rotary member within the stationary member has two or more axially spaced turbine wheels mounted on a rotary shaft with the turbine wheels within the casing portions and arranged with turbine blades that receive exhaust gases from the chamber directed through vanes at a particular angle to enhance the thrust on the two turbine wheels. An impeller on the rotary shaft draws air along the axis of the shaft, out in a radial direction around the chambers, through minute openings in a manifold section, and back in a radial direction to disburse the air into the combustion chambers for burning of a fuel-air mixture therein to produce the exhaust gases.

Abstract: In order to limnit the exhaust particulate emission when supercharging a pressure wave machine-supercharged internal combustion engine, an exhaust particulates filter is arranged in the high-pressure part of the exhaust gas system ahead of the pressure wave machine.By increasing the supply of fuel to the engine itself and/or briefly closing a charge air flap valve a recirculation flap valve and/or brief opening of a exhaust gas by-pass valve, the exhaust gas attains the combustion temperature of soot components deposited on the surface of the filter. These soot components are burned off, and the filter is automatically regenerated.

Abstract: An exhaust gas purification apparatus in an internal combustion engine comprising a control device for biasing the air-fuel ratio of the exhaust gas toward the rich side or the lean side from the theoretical perfect air-fuel ratio in accordance with an operating condition of the engine. The control device can include a control valve controlled to open and close according to the output signal of an exhaust gas sensor interposed in a secondary air introducing passage connected to the exhaust passage of the engine upstream of the catalyzer. The control device can also include a device for causing a delay in opening or a delay in closing of the control valve in accordance with the operating condition of the engine.

Abstract: In a hydrostatic auxiliary power steering apparatus, a short-circuit passage of a control valve establishes a restricted flow path from a pump pressure line to a reservoir return line in the neutral position of the control valve wherein all other flow paths are blocked. A fixed flow restrictor in the pump pressure line conducts a continuous flow from one of two pumps connected to the pressure line for regulation of the fluid power steering circuit by the pressure drop across the flow restrictor. If one of the pumps is of the variable volume type, the pressure downstream of the flow restrictor is utilized to regulate pump flow adjustment. If fluid under operating pressure is supplied to both the fluid power steering circuit and another fluid operating circuit, a flow dividing valve controlled by the pressure differential across the flow restrictor distributes pressurized fluid between the two fluid circuits.

Abstract: A hydrostatic steering system having a hand operated metering pump and steering control valve regulating and distributing fluid flow from a servo pump to a piston servomotor of the differential pressure surface type. A compensation valve disposed in the pressure line leading to one of the opposed chambers of the piston servomotor, is actuated by a differential pressure surface dimensioned to establish a constant ratio of pressures prevailing in the opposed pressure chambers in the neutral steering position while the metering pump is ineffective to produce any differential pressure. During active steering, the compensation valve is bypassed through a check valve.

Abstract: A hydrostatic machine having a fixed displacement volume which is connected to the operating chamber of a hydraulic cylinder which machine is mechanically coupled to a second hydrostatic machine having a variable displacement volume to control the force exerted by the hydraulic cylinder. When control liquid is displaced from the working chamber of the cylinder the first machine acting as a motor drives the second machine which displaces control liquid into an accumulator. Vice versa, liquid is taken from the accumulator and the second machine acting as a motor drives the first machine which feeds liquid into the working chamber. The pressure in the working chamber, or, respectively, the force exerted by the cylinder is maintained constant by a corresponding adjustment of the displacement volume of the second machine.

Abstract: An improved crank-type Stirling engine. A spring, preferably a gas spring, is linked between the displacer and the housing or alternatively the power piston. The spring is relaxed at substantially a mean position of the displacer to apply a centering force upon the displacer. The spring reduces the loading on the displacer drive linkage by itself exerting a centering force upon the displacer. If desired, displacer linkage forces may be reduced nearly to zero by designing the spring so that the spring constant and the masses upon which it operates are in resonance. The gas spring mechanism may include pump elements so that it will operate as a pump to charge the engine to operating pressure with atmospheric air during initial start up operation.

Abstract: A mechanical actuator can be constructed by employing a plurality of memory metal actuator elements in parallel to control the amount of actuating force. In order to facilitate direct control by digital control signals provided by a computer or the like, the actuating elements may vary in stiffness according to a binary relationship. The cooling or reset time of the actuator elements can be reduced by employing Peltier junction cooling assemblies in the actuator.

Abstract: Spindle drive for a power shaft. A pawl is mounted on the spindle, the spindle being connected to be rotated by stroke action of the pawl. An expansible chamber motor is connected to the pawl to rotate the spindle. The expansible chamber motor contains two different fluids. An electrical resistance wire passes through one of the fluids. A source of electricity is connected to the wire whereby the fluid becomes energized by the electrical resistance wire and thermo expansion inside the motor will rotate the spindle to do physical work.

Abstract: The piston of an hydraulic master cylinder is guided to slide in portions of a bore in a body on opposite sides of a port in the wall of the body by a guide portion of the piston which is disposed on the outermost side of the port and by a cylindrical, axially extending, guide part at the outer end of a radial flange on a retainer. The retainer is mounted on an extension at the inner end of the piston and forms an abutment for a return spring for the piston.

Abstract: A system for concentration of waste cooling tower blowdown in a steam turbine power plant. The cooling tower blowdown feed is withdrawn from a main power plant condenser and is recirculated through an auxiliary cooling tower and an auxiliary condenser. The auxiliary condenser utilizes waste heat steam drawn from the main condenser as an energy source. Evaporation continuously takes place in the auxiliary cooling tower concentrating the cooling tower blowdown so that it may be withdrawn and sent to a concentrating pond or other slurry handling station for final disposal.

Abstract: A working fluid in the gaseous state at some initial temperature and pressure is expanded polytropically to a resulting exhaust fluid having some lower temperature and pressure in order to produce useful work. Large quantities of a pressured motive liquid are then employed as the vehicle for approximating an isenthalpic compression of the working fluid. The preferred method for effecting this recompression is to provide an overall adiabatic environment within which the two fluids are placed in thermal but not physical communication. The working fluid is then energized by direct compression during which partial condensation of the working fluid is accompanied by heat transfer to the motive liquid. Thereafter the two fluids are mixed, with the resulting two phases permitting separation and reconstitution of the motive and working fluids to their initial states to complete the thermodynamic cycle which, depending upon the fluids selected, can be located in a broad range of the temperature spectrum.

Abstract: A pressure stabilization system for a linear compressor 20 piston 24 in which a check valve 68 and passages 72, 64 within the piston permit communication between a compressor work space and a non-working volume of gas 54 through an orifice 66 in the piston cylinder 30. The check valve and ports allow momentary fluid communication between the dead space volume 54 and the working volume 26. The fluid communication serves to stabilize working volume pressure and counteract the effects of gas leakage about the piston 24 and into the dead volume 54. This fluid communication only occurs when dead volume pressure is greater than working volume pressure and port 66 and 64 are axially aligned.

Abstract: Refrigerant liquid containing a little oil dissolved is vaporized while cooling the motor and a portion of the vaporization products is sent into the bearings to be lubricated.The large excess of available heat permits dispensing with an oil recirculating pump and keeping in the motor casing, acting as a sump, the major part of the oil present.

Abstract: A refrigerant monitor and alarm includes a sensor positioned to detect the level of liquid state refrigerant in the system and provide an electrical output signal therefrom, a digital display for displaying the refrigerant level, and a circuit coupling the digital display to the sensor for actuating the digital display. In a preferred embodiment, the level display is a bar-graph LED-type display incorporated on a control panel also including a refrigerant level alarm and other parameter alarms.

Abstract: A reversible mode heating and cooling system comprises a reversible heat pump unit having a compressor, a reversible valve, an indoor heat exchanger in heat exchange relationship with indoor ambient air a water cooled concentrator, refrigerant expansion means, an outdoor heat exchanger in heat exchange relationship with outdoor ambient air and an auxiliary heat exchanger in heat exchange relationship with a water source for enhancing the capacity and efficiency of the system to transfer heat to the refrigerant during the heating mode at low outdoor ambient temperatures. The concentrator is disposed downstream of the outdoor heat exchanger (condenser) in the cooling mode of operation to cool the refrigerant exiting the heat exchanger for enhancing its ability to absorb heat in the indoor heat exchanger (evaporator).

Abstract: A non-reversible multiple-refrigeration-cycle solar apparatus, including a variable directing valve mechanism for conditioning a medium, defrosting the apparatus, and absorbing, storing and using solar energy.

Abstract: A refrigerated trailer 10 which is subject to having a restricted normal return air flow path back to the refrigeration unit 24 through the suction space 46 in communication with the return air inlet 34 of the unit, due to volume and arrangement of the load 42, is provided with secondary air return ducts 48 and 50 which are also in communication with the suction space 46 to ensure an adequate return air flow to the unit and thereby also assuring an adequate discharge of air to the rear 22 of the trailer.

Abstract: According to the invention a baffle is provided in a dual inlet air conditioner blower wheel and is selectively movable within the blower wheel between the inlets to adjust the air delivery through the inlets while maintaining a substantially constant total volume delivery. The air mixture is adjustable is desired proportions between full volume indoor and full volume outdoor air and is presented to a blower wheel and centrifugally propelled into a space to be conditioned.

Abstract: A vent assembly for use in an air conditioning unit is disclosed. The vent assembly extends from the condenser fan shroud to the partition for directing air at a relatively higher condenser fan pressure through the vent assembly to the indoor section wherein the evaporator fan circulates the air to the indoor section to be conditioned. The vent assembly is an integral self-contained portion capable of being easily inserted within an existing unit for effecting desired airflow control.

Abstract: A device for storing and automatic drawing of so-called intermediate elements for loading, feeding and discharge of certain products, from a freezer to horizontal plates, having thereto connected a system outside of the freezer cabinet for carrying the intermediate elements coming out of the cabinet back to the cabinet inlet, characterized by comprising means outside of the cabinet for receiving and supporting said intermediate elements, a device being provided for bringing the intermediate elements coming out of the cabinet onto said means.

Abstract: An air cycle air conditioning system (10) is provided with regenerative heat exchangers (80, 110) upstream and downstream of an expansion turbine (90). A closed-loop liquid circulatory system serially connects the two regenerative heat exchangers for regeneration without the bulk associated with air-to-air heat exchange. The liquid circulatory system may also provide heat transport to a remote sink heat exchanger (150) and from a remote load (20) as well as heat exchange within the sink heat exchanger and load for enhanced compactness and efficiency.

Abstract: An absorption heat pump is described comprising at least an evaporator, an absorber, a vapor generator and a condenser and in which at least one of the components is in the form of one or more rotatable plates across the thickness of which plate(s) a heat transfer takes place. Such a heat pump can be designed in compact form.

Abstract: A multiple regeneration multiple absorption type heat pump having a multiple absorption system and a multiple regeneration system and adapted so that a refrigerant and an absorbent are circulated between the two systems and so that a fluid to be heated is passed therethrough the multiple absorption system comprises an evaporator for evaporating the refrigerant by a heat from an external low-temperature heat source, at least one absorbing/evaporating unit for allowing the absorbent to absorb the refrigerant vapor from the evaporator or a preceding similar absorbing/evaporating unit and for evaporating the refrigerant by the heat of absorption, and an absorber for allowing the absorbent to absorb the refrigerant vapor from the or a preceding absorbing/evaporating unit and for heating the to-be-heated fluid by the heat of absorption.

Abstract: A knitting needle with a flexible cord comprising at least one rigid needle body made of bamboo or wood whose rear end is formed with a limited length of axial bore into which a rigid tubular member is inserted and fastened there, a flexible cord having an integral axial extension which axially extends forwardly from an enlarged forward end wall of a substantially conical enlargement formed therewith, and both of a rear end wall of the tubular member and the annular terminal end wall of the needle body being in contact with the enlarged forward end wall of the enlargement.

Abstract: A stamped knitting tool for knitting or weaving machines is provided having a shank which is provided with at least one foot and at least two guide portions which extend down to the lower region of the shank. These guide portions are connected above the lower region of the shank by means of a rib thereabove having a width of at least 1.1 mm and at least one of the guide portions supports the foot. The tool is further characterized in that a lower rib of about equal width is provided along the lower region of the shank.

Abstract: A flat bed knitting machine having a high speed secondary stitch adjustment. A secondary guide bar mounts a secondary guide and is connected by connection means to a main guide bar mounting a plurality of main guides wherein the two guide bars may swing together and wherein they may shog independently of one another.

Abstract: The present invention is designed to detect instantaneous variations in the current flowing through a motor (5), instantaneous variations in the rotation of an agitating body (4), or instantaneous variations in the rotation of the motor (5) to thereby detect the washing load size. On the basis of the detection signal, the washing process is controlled to make it possible to properly set the washing bath ratio, detergent concentration, washing time, and number of revolutions of the fabrics being washed.

Abstract: A security cover for automobile in-dash mounted audio equipment provides a protective theft defeating barrier. The cover includes a lock cylinder adapted for removably securing the cover to internal support rods which are pivotally anchored at one end to a portion of the automobile body. The lock cylinder has a shaft which is threadably received in the other end of the support rod. The cylinder can be rotated by a key for urging the cover into engagement with the dashboard and, thus, encasing the audio equipment.

Abstract: A locking device to be locked onto the kingpin of a trailer to prevent its being engaged by the fifth wheel of an unauthorized tractor. The locking device closely encircles the kingpin and houses within an aperture a locking bar that is adapted to be pressed into engagement with the kingpin recess or groove. The outer wall of the locking device casing has a protrusion in the area of the locking bar aperture such that the locking bar and the locking unit disposed therein are recessed within the aperture and thereby protected. The locking bar aperture from the outer end of the locking bar when in the locked position to the outer wall of the protrusion on the casing is counterbored beyond the transverse cross-section of the locking bar.

Abstract: Herein disclosed is a dry type continuous wire drawing process which can retain satisfactory working circumstances while eliminating the problem of disposal of waste liquids. The wire drawing process includes the steps of descaling a wire to be drawn, coating the descaled wire with a lubricant, and drawing the lubricant-coated wire through a drawing die. The descaling step is conducted in a mechanical manner. At the lubricant coating step, the descaled wire is once coated with lime powder and then with metallic soap powder. Thus. the three steps recited are conducted under dry and continuous conditions. At the lubricant coating step, the lime-coated wire may be coated with powder of sodium stearate before it is coated with the metallic soap.

Abstract: A solid lubricant such as MoS.sub.2 is applied to certain carbon and stainless steels after surface voids have been produced in the material by one or two annealings before final cold working the material to finished size. The latter operation imbeds or includes the lubricant into the material and thereby provides a superior lubricated steel for piston rings, shaft, valve stem, spring, stranded wire, and the like applications. The technique involved may also employ corrosion inhibiting agents to increase resistance to corrosion of the steel as well as to impove its lubricity.

Abstract: Flat metal strip of indeterminate length is apertured in a punch press having a flying die set to define a lengthwise succession of identical workpiece blanks connected by strap-like portions of the strip adjacent to its longitudinal edges. That press, each time it operates, makes two apertures that define respective end edges of a blank. The strip is pulled lengthwise through that press by roller forming apparatus which imparts a predetermined transverse profile to it and propels it through a flying shear press whereby each blank is severed from the rest of the strip. On a conveyor having two stretches bridged by the severed blank and moving faster than the strip the severed blank is carried to a folding press. There a ram rises from between the conveyor stretches, lifting the blank off of the conveyor and clamping it against a folding die.

Abstract: The present invention provides a novel process for forming a cell can or container, for a cylindrical battery having longitudinally extending internally projecting ribs which are formed along the internal surface of the battery cell. These ribs provide increased physical and electrical contact between the cell and the electrode material disposed therein. Also disclosed herein is the product formed by this process.

Abstract: Apparatus is provided for bending one or two complete rows of leads on a dual-in-line semiconductor package at one time without damaging the leads. The leads of the dual-in-line package are initially in their manufactured position, extending horizontally from the sides of the package and generally parallel to the top and bottom surface thereof. A support anvil is placed under the portion of the lead which is sealed in the semiconductor package, and a punch or bending member is disposed immediately adjacent the outside edge of the handle for performing the actual bending. A sheet of relatively thin metal is formed into a U-shaped channel and the bending member inserted therein before lowering so that as the bending member is lowered, no portion thereof touches the surface of the leads being bent. The sheet of thin metal buffers the bending operation and is interposed between the bottom and side of the bending member and the face of the leads for preventing scratching or damage thereto.

Abstract: This invention relates to a tool for uniformly compressing a non-resilient metal ring to a smaller diameter which comprises an outer hollow receiver provided with a handle for manually holding the receiver against turning, a threaded shaft in the receiver which at its one end within the receiver has rotatably mounted thereon a collet which upon being drawn into the receiver by rotation of the threaded shaft causes the fingers of the collet by engagement with the inner wall of the receiver to move inwardly or toward each other to thereby uniformly compress to a smaller diameter a metal ring mounted in the ends of the collet fingers.

Abstract: A tool for securing a tap duct to an opening in a tap duct sized main duct having a base structure for extending transversely across and seating in supported relationship against the exterior open end of a tap duct flanged at the opposite end; an anvil structure movable so as to force the flanged end of said tap duct outwardly and toward the interior wall of a main duct; manually activated bending structure mounted on said base structure suitable for extending said anvil structure against the flanges of said tap duct outwardly and toward the interior wall of said main duct.

Abstract: A gas doser, including a gas input member, a gas output member and a charge-over rotor therebetween. The input member includes a gas input member having a carrier gas input port, a calibrating gas input port, a first chamber communicating with the carrier gas input port and a second chamber communicating with the calibrating gas input port. The output member has a carrier gas output port and a calibrating gas output port, respectively communicating with a third chamber and a fourth chamber. The rotor has a carrier gas ventilating conduit for providing communication between the first chamber and the third chamber, and calibrating gas measuring conduits for providing communication between the second chamber and the fourth chamber. Opposite ends of the ventilating conduit and the measuring conduits are mutually spaced from each other about the rotor axis at equal distances from the axis.

Abstract: A method for detecting the oxygen concentration of a gas to be measured is disclosed using the limiting current type oxygen sensor. The method is characterized in that the relationship of an inclined straight line between the voltages applied to the oxygen sensor and the currents outputted therefrom is determined in such a manner that the inclined straight line may pass through the flat portions of the limiting current in the voltage-current characteristics curves at the different oxygen concentrations. The relationship between the outputted currents and the oxygen concentrations at the flat portion is such that when a given magnitude of voltage is applied to the oxygen sensor to cause it to output a current, a voltage which corresponds to this current at the inclined straight line is determined. The voltage thus determined is applied to the oxygen sensor to cause it to output a current.

Abstract: A dynamic pressure test unit is utilized to determine the yield point of a lask. For a period of time prior to the yield point being reached the ratio of the pressure vs. volume of water pumped into a test flask assumes a constant value. After reaching the yield point the volume indication increases at a faster rate than the pressure giving a negative slope to a line on a stripchart recorder that indicates the pressure divided by the volume of water pumped into the flask.

Abstract: A reference pulse verification circuit is disclosed in which a sensor senses the passage of a number of teeth which project from a wheel rotated by an engine crankshaft. The projecting teeth are uniformly disposed about the wheel except for a missing tooth area corresponding to a predetermined angular reference position of the engine crankshaft. A missing pulse detector provides unverified reference pulses corresponding to the occurrence of the missing tooth reference position, and a verification counter is incremented in response to each sensor pulse produced in response to the passage of each rotating tooth. The counter output and the missing pulse detector output are combined such that a verified reference pulse is provided in response to each missing pulse detection which coincides with the occurrence of a predetermined tooth pulse count that was initiated after the occurrence of a preceeding missing pulse detection.

Abstract: An engine crank angle determining arrangement including a rotor having teeth or slits wherein either a tooth is entirely omitted or the teeth or slits are formed with non-uniform intervals therebetween. The teeth or slits are detected by an electromagnetic pick-up device or a photocoupler, and the time intervals corresponding to the intervals between the teeth or slits in the signal thus detected are processed in accordance with a predetermined program. The time intervals thus processed are corrected in consideration of an engine low state or non-low state operating condition, such as for example transient condition or starting condition, of the engine. Processing is carried out in either of two different ways of calculating reference angles.

Abstract: In accordance with an illustrative embodiment of the present invention, a drill stem testing apparatus includes a housing leaving a full-opening bore, and a main test valve for opening and closing the bore in order to flow and shut-in the formation interval being tested. The apparatus further includes a first port means for communicating the pressure of fluids in the bore below the test valve to a first pressure transducer, a second port means for communicating the pressure of fluids in the bore above the test valve to a second pressure transducer, and a third port means for communicating the pressure of fluids in the well annulus externally of the housing to a third pressure transducer. The outputs of the respective transducers are fed to a recording gauge so that a pressure record is obtained of the changes in fluid pressure that occur in the bore of the housing above and below the test valve as well as in the annulus externally of the housing.