Abstract: An animal trap adapted for outdoor use to catch relatively small game animals and particularly adapted to be attached to a tree, post, or the like upstanding support and to be used independently of the height of snow and of other unfavorable ground conditions. This animal trap has a fixed jaw and a movable jaw. A bracket with arms projects away from the plane of the fixed jaw. The movable jaw is pivoted to an operative position angularly upwardly relative to the fixed jaw. A detent lever is pivoted between the arms of the bracket with an outer end forming a catch portion intercepting the movable jaw and holding it in operative position. A pair of spring wires operatively bias the movable jaw and cooperate with a chain to attach the trap to a tree, post, or the like, and the bait is attached to the detent lever to pivot the latter and release the movable jaw that then closes against the fixed jaw under the action of the spring wires.

Abstract: The disclosure relates to a rodent exterminator wherein a box includes electrical wires at opposite sides of an entry opening thereinto with a hinged top for disconnectably providing power to the wires and permitting easy removal of an exterminated rodent with rapid availability for reuse. The box includes air vents in one side to permit the aroma of bait therein to permeate external to the box.

Abstract: Apparatus, especially hand-held, battery-powered apparatus, for the collection and disposal of insects through an open end thereof. In one embodiment, which may be in the form of an attachment for a conventional battery-powered vacuum cleaner, the insect is retained on a screen mounted on a carriage which is movable between rear and front positions within a housing. The front position is close to the open end, and after collecting the insect with the carriage in the rear position, the carriage is moved to the front position, where it is brought to an abrupt stop so that the insect is ejected from the apparatus. The ejection of the insect can alternatively or additionally be assisted by reversing the direction of the air flow through the open end.

Abstract: Novel methods are provided for the preparation and delivery of botanic seeds which are pregerminated and maintained in a hydrated state in gel capsules. Various types of botanic seeds are encapsulated, in some embodiments, with beneficial additives, in a gel matrix and pregerminated. These pregerminated seeds emerge more quickly than raw seeds from a number of planting matrices. These seeds can be encapsulated and pregerminated in variously described ways.

Abstract: Rod-shaped incipient plant carrying devices which contain or can contain seeds or plant cuttings are formed from a web of paper and a filler of synthetic fibers and/or particles of synthetic foam which are first accumulated into a relatively thin but wide layer which is thereupon converted into a narrow stream. The stream is condensed and simultaneously draped into the web to form therewith a continuous rod which is severed by a cutoff to yield a file of discrete carring devices of unit length or multiple unit length. Particles of fertilizer can be admixed to the fibers and/or foam particles of the stream, and spaced-apart portions of the stream can receive seeds in such distribution that the seed in the finished carrying device is equidistant from both end faces of the filler. A bonding agent can be sprayed onto the layer to ensure adherence of neighboring fibers and/or foam particles to one another.

Abstract: An integrated hydroponic system including subsystems for support and movement of plants, controlling the atmosphere around the plants and nutrient distribution. The support and movement subsystem features diverging trough-in-trough construction where the interior trough is formed by discrete autoclavable plastic troughs which are slidably removable for sanitation purposes from supporting exterior troughs which in turn support nutrient distribution tubing and a rotatable variable pitch drive screw for moving individual plant holders along the troughs in graduated increments. The atmospheric control system features supply and exhaust ducts under the troughs which establish a blanket of air in the zone proximate to the trough where the temperature, humidity and carbon dioxide concentration are regulated. The nutrient distribution system involves recycling the thermally and component regulated dilute nutrient fluids from a reservoir to the plants and back into the reservoir.

Abstract: A method and machine for forming longitudinally curved tooth surfaces in bevel and hypoid gears. A dish-shaped grinding wheel 26 is rotated about its axis 76 and oscillated about a cradle axis 66 in a timed relationship with a relative reciprocation of a work gear 20 along cradle axis 66. The timed relationship is defined by a power series equation to permit a simultaneous form grinding of adjacent tooth sides of one member of a work gear pair to be appropriately mismatched with simultaneously generated adjacent tooth sides of the mating member of the gear pair. A dish-shaped grinding wheel 176 having inner and outer stock removing surfaces 178, 180 for working opposite sides of gear teeth is also used in accordance with special timed motions of the present invention to improve contact characteristics between mating gear teeth.

Abstract: A mask for use in conjunction with a lapping platen for working an ultra thin work piece with the mask formed to provide circumferentially arranged open receptive areas corresponding to the configuration of the work piece together with a pressure block of identical configuration to the receptacle openings and the work piece for maintaining the same in a controlled flatness upon the rotating lapping platen of a lapping machine.

Abstract: An apparatus for cleaning pool tile comprises the body of a string trimmer, an abrasion member detachably mounted at the end of the rotatable drive shaft of the string trimmer in place of the usual lawn care accessory, and a dispensing unit for delivering cleaning fluid to the surface of the abrasion member.

Abstract: A method for surface treating a continuous flow of workpieces includes the steps of fluidizing a stationary bed of surface treating media, aggitating the fluidized bed of surface treating media to create a scrubbing action to the surface treating media, submerging the workpieces to be treated in the stationary, fluidized, aggitated media bed subjecting the workpieces to the scrubbing action of the media, holding the submerged workpiece stationary within the fluidized, aggitated bed of surface treating media, releasing the hold on the workpiece, and removing the workpiece from the bed of surface treating media.

Abstract: A construction of a building with the multiple floors underground for the interment of human remains, and with the multiple floors above the ground level for the use of storage of earthen jars of human bones or ashes. The floors underground are provided with earthen walls serving as the dead ends of the compartments and extending up from the very bottom soil of the building and connecting with natural earth. Longitudinal and lateral corridors are intersecting with each other at convenient intervals, and all are leading to the entrance of a given floor. Servicing at the entrances of all floors is elevator(s) going through the entire building, both underground and above.

Abstract: A flat roof cover system comprising a facia edge plate and a generally flat roof substructure which includes a nailable perimetral edge strip, and a waterproof rubber-like membrane cover of a length to extend beyond the edge strip. A rigid clip having a flat nailing portion is nailed to the upper face of the edge strip. The clip has a rigid inversely disposed V-shaped portion with a wall extending down along the building which terminates in a lock flange. A facia plate, having a like deformable resilient V-shaped portion terminating in a reversely turned edge bearing on said membrane edge and the clip plate gravel stop surface beneath it, has a latch socket to snap over said lock flange.

Abstract: The invention relates to improved means used to fold and/or unfold a portable building of the type in which members are hingedly connected to a rigid central section to reduce its external volume and facilitate transportation of the building. The rigid central section comprises a floor, walls and roof. Additional roof members are pivotally connected to the roof along opposed parallel edges so as to be movable between an extended position in which they form a continuation of the central roof, and a further position in which they are disposed parallel with the vertical walls of the central section. Additional floor members are connected to opposed parallel edges of the central section floor which are parallel with the additional roof members. The additional floor members are moveable to form an extension of the central section floor or to be parallel with the central section walls.

Abstract: A fascia for securing a rubber membrane against the surface of a roof, the fascia including a rigid planar plate portion adapted to be secured to the generally vertical edge portion of the roof and to clampingly engage a portion of the rubber membrane to secure the rubber membrane against the vertical surface, and a rigid flange projecting from the planar plate portion and including a lower surface adapted to engage a portion of the membrane supported by the surface of the roof adjacent the edge and to secure the membrane against the upper surface of the roof.

Abstract: A semi-circular dual window panel unit is supported by a correspondingly-shaped frame assembly including wood jamb members and removable wood sash members which extend completely around the window panel unit and confine an edge portion of the unit. A one-piece sheet of plastics material is vacuum-formed into a semi-circular cap member which is bonded to the frame. The cap member has an outwardly projecting mounting flange and an inwardly projecting protector flange which is spaced in front of the window panel unit by spacer strips. The protector flange has an inner peripheral lip bonded to the edge portion of the window panel unit by a resilient sealant material.

Abstract: An assembly is disclosed for forming a raised roof edge on a building structure that preferably has a generally horizontal roof and a geneally vertical outer face. The assembly includes a dam member for forming a water dam or gravel stop and a fascia member. Preferably, the dam member is a one-piece structure, including a clamping and retention portion and a vertical intermediate portion, and biases and secures the fascia member into a relatively tight and rattle-free interlocking installation on the dam member. Preferably, a roofing material is gripped and held against the dam member as a result of the biasing forces of the clamping and retention portion and the intermediate dam portion. The roof edge assembly thereby provides an improved water dam or gravel stop structure that securely retains the roofing material on the roof of the building structure without penetrating the roofing material, at least along the roof surface.

Abstract: A structural support brace for supporting the deck and wall of a swimming pool or similar structure comprising a body including an upwardly facing support surface for the deck, a plurality of stake guides and a plurality of stakes. The stakes are slideably positioned within the stake guides and securable within the stake guides at selected points. A sleeve is positioned on the stake guides. The sleeve provides a form for a poured concrete pillar. The pillar both anchors the brace and provides structural support for the deck.

Abstract: A continuous preset access housing formed in part by a corrugated housing member is disclosed. A corrugated decking sheet supports the longitudinally extending housing member above cells of the decking sheet and a layer of concrete is placed over the deck and housing. Openings through the concrete and housing member provide access to the underlying deck cells. Covers are provided over the openings to create fully enclosed underfloor housings to receive electrical receptacles and the like. The overall arrangement is such that the resulting system has increased flexibility, capacity and strength. Additionally, the system is more cost effective than systems which provide many individual housings.

Abstract: A scar-resistant decorative wall panel has a mirror surface overlaid by a substantially coarse-mesh, common weave wire screen giving a peek-through changing-with-angle view of the mirror surface. Viewed at the perpendicular to it, the mirror surface gives a substantial-area reflection of the viewer that may be as much as 30 to 50% of the mirror surface. At angles from the perpendicular increasingly approaching 45 degrees, the view of the mirror surface progressively diminishes for two reasons: (1) the weave of the mesh blocks progressively more of the view of the mirror surface and (2) the reflection of the back surface of the mesh appears to occupy increasing areas of this mirror surface, decreasing in this way the view of this mirror surface. Both these phenomena act together in a tendency to hide and confuse to a casual viewer defacement of the mirror surface, and the substantially vandal-proof overlying coarse-mesh screen at the same time protects the mirror surface from broad-area-contact type scarring.

Abstract: An expansion joint seal assembly comprising elastomeric face and back seals joined by a tear strip and mounted between abutting adjacent building surfaces by press-fitting holding arrows integrally formed with the face and back seals into corresponding receptacles in a retaining frame mounted to each of the building surfaces. The elastomeric face and back seals are provided with accordion-like surface contours that allow the space between the abutting building surfaces to expand and contract due to thermal expansion, wind drift, settling and seismic motions upon the building structure while maintaining an impervious seal. The elastomeric face and back seals and tear strip are produced from a single extrusion of a flexible material, and may be of a type susceptible of coloration.

Abstract: Two side-by-side roofing panels (12,14) are connected by a reinforced connecting sheet member (40) extending between the panels (12,14) and fastened to the outside surfaces of the panels (12,14). A bead (56,58) of flowable material is positioned between the connecting sheet member (40) and the outside surface of at least one of the panels (12,14) in a space adjacent the respective side (18,20) so that upon movement of the panels (12,14) apart the connecting sheet member (40) will be straightened out and the flowable material of the bead (56,58) will be displaced into the gap (22) between the sides (18,20) of the panels (12,14).

Abstract: An adapter for use with a support grid for ceiling elements. In particular the adapter mounts on a horizontal bottom portion of an inverted T-shaped support. The adapter has a first flange forming a C-shaped clip. A plurality of such flanges are spaced along the adapter length so they do not interfere with cross-support members. Second flange portions support the ceiling elements. Additionally, third flange portions are provided to prevent transverse movement of the adapter relative the support. The third flange portions are also spaced to prevent interference with cross supports.

Abstract: A connector arrangement for joining adjacent chord bar reinforcements in wall panels for prefabricated tilt-up concrete buildings. The chord bar connection is comprised of a plurality of chord bars welded to a steel plate cast into the concrete of a prefabricated wall. Adjacent walls are connected by bolts passing through the metal plates attached to the cast in concrete chord bars. The bolting arrangement allows free movement of adjacent panels during dimensional changes caused by temperature and moisture variations in the concrete.

Abstract: An ossature comprising a truss constituted by a plurality of mutually parallel vertical elements, and a lower rail and an upper rail on which the ends of the vertical elements engage when the truss is deployed, is characterized by the fact that these vertical elements are connected together by at least one strap which is perpendicular to them when the truss is deployed.

Abstract: A frame assembly for a building opening such as a roof hatch or scuttle, wherein frame elements and integral or separate connecting elements therefor are adapted for on-site assembly and leak-proof securement to a building roof or wall, both manufacture and installation being relatively uncomplicated operations and the resulting structures being adapted to meet high standards of performance.

Abstract: A method for manufacturing an elongated, box-like structural component comprising two mutually opposing side-members (1, 2) which define a cavity therebetween. The mutually opposing surfaces of the side-members present longitudinally extending grooves into which projections on distance pieces (3) located between the members engage. In the process of manufacturing the structural component pairs of boards or the like are advanced in spaced relationship in the longitudinal direction of the boards into a receiving station (7) with the grooved inner surfaces of the boards facing one another, the distance pieces (3) being placing between the boards as they enter the station (7). As the boards leave the station, they are pressed towards one another in a manner to bring the projections on the distance pieces (3) into engagement with the grooves on the inwardly facing surfaces of the boards.

Abstract: A wrapping-paper feeding apparatus for use in a coin wrapper includes a paper feeding roller for drawing wrapping paper out of a wrapping-paper storage portion, wrapping rollers for wrapping the wrapping-paper fed out of the paper feeding roller around accumulated coins and a cutter disposed between the paper feeding roller and the wrapping rollers. A paper cutting roller is disposed between the paper feeding roller and the wrapping rollers to impart tension to the wrapping paper so as to cut the wrapping paper by the cutter.

Abstract: For packing filled bags into boxes an apparatus is provided which includes a receiving plate for collecting bags in a row, and a pusher plate for pushing the row to a position above a box to allow the row to fall into the box. To achieve an accurate positioning of the rows of bags in a box and a high degree of filling of the box a movable cassette is positioned above a waiting box. In order to bridge over the varying distance between the cassette and the receiving plate, a bridging plate extends between the cassette and the receiving plate. Preferably the bridging plate is in the form of a slide plate which is joined to the cassette.

Abstract: Described is a drive for injection mould parts of a synthetic plastics injection moulding apparatus for injecting a wall part on a paper web, with at least one supply injector fixed on a carrier, a plurality of injector heads rigidly connected thereto and with driven connecting levers.

Abstract: Mail inserting and collating apparatus includes an envelope conveyor for continuously conveying envelopes along a first path; a plurality of envelope carriers mounted on the envelope conveyor and movable therewith, for holding the envelopes; an insert conveyor for continuously conveying a plurality of inserts along a second path, at least a portion of the second path running substantially parallel and adjacent to the first path; a plurality of pockets mounted on the insert conveyor and movable therewith, for holding the inserts; a rotatable kicker roller for removing a lowermost insert from a stack of inserts and moving the lowermost insert toward a pocket adjacent the stack, the kicker roller having an arcuate rubber projecting surface for engaging the lowermost insert from the stack during rotation of the kicker roller and a vacuum port extending through the kicker roller and terminating in the projecting surface; a drive for intermittently rotating the kicker roller; a vacuum supply for supplying a vacuum

Abstract: A cord line mower is provided and consists of the combination of a regular rotary mower with a cord line trimmer apparatus. A mechanism is included that can release extra cord line, as needed when the mower is in operation.

Abstract: The invention relates to a tangential belt drive for a plurality of similar work units of a machine for the production of twisted or twined yarn. These units are subdivided into sections each having at least approximately the same number of work units and each driven through a tangential belt by an electric motor. Thereby, the number of work units in each section is established taking into account the required power and permissible belt stretch, so that the tangential belts have a considerably reduced width and thickness, compared to the ones commonly used. Further, the guide rollers of the tangential belts of neighboring sections are corotationally connected to each other.In order to improve synchronization and power transmission between sections, the contact angle is increased at the guide rollers and the drive pulleys. This may be done through the corresponding spatial arrangement of the drive pulleys with respect to the guide rollers or through use of an intermediate belt arrangement.

Abstract: A steel cord usable for the reinforcement of rubber articles comprises a core of a single steel filament, an inner sheath composed of six steel filaments and an outer sheath composed of 7 to 12 steel filaments, wherein the steel filaments constituting the core, inner sheath and outer sheath have a diameter of 0.20.about.0.40 mm and satisfy the particular relations.

Abstract: For piecing to an open-end friction spinning device with two friction spinning elements normally driven in the same direction of rotation and forming a nip therebetween, of which friction spinning elements at least one is capable of being subjected to suction, fibers are continuously fed to the nip and are then immediately removed from same. While fiber feeding continues uninterruptedly, the removal of fibers from such nip is then discontinued, so that fibers remain in the nip and form a rotating accumulation of fibers. A yarn end is then introduced to such accumulation of fibers. Newly formed yarn is then drawn off from the nip while fibers being fed continuously to such nip are continuously formed into such yarn. For such removal of fibers, a controllable suction air nozzle may be directed towards the above-mentioned nip from a side of the friction spinning elements opposite such nip.

Abstract: This invention relates to a space vehicle 10 in which solar radiation is utilized to generate thrust by virtue of a solar thermal propulsion unit 12. The propulsion unit comprises basically reaction engines 14 including a DeLaval nozzle 22, heating chamber 26, solar window 28 and inflatable paraboloid solar collector 34.

Abstract: The present invention provides a regeneratively cooled rocket combustor comprising a combustor wall, a plurality of coolant channels extending through the combustor wall and at least one keel-rib extending into each coolant channel from the channel roof and which is bounded on both of its sides by arcuate flutes for providing smooth and continuous surface transition between the keel-rib and adjoining interior surfaces of the coolant channel.

Abstract: A hydrokinetic coupling has a primary vane wheel (11) and a secondary vane wheel (12), which define a toroidal working chamber. A shell (17) rotates with the primary vane wheel and envelops the secondary vane wheel. A constantly open and throttled outlet port (31) and an outlet valve (32) are disposed within the shell. The outlet valve can be closed by means of fluid pressure generated in a control line (33). In accordance with the invention, the control line has a fluid inlet (34) which is disposed in the shell interior. This is arranged at a determined distance from the axis of rotation of the coupling, so that fluid can only penetrate into the control line (33) if the slip in the coupling has assumed a specific minimum value. In this condition the outlet valve (32) is consequently closed, whereas it is opened at greater slip values.

Abstract: A marine engine exhaust muffler assembly (8) includes inlet and outlet members (10, 11), the axes (13, 14) of which are offset from each other. A muffler housing (12) is disposed between the inlet and outlet members and forms a chamber (15) having disposed therein an annular multi-layered cartridge (23), and with the layers having a multiplicity of perforations (27) therein for passage of exhaust gases and spent engine cooling water therethrough. The water assists in keeping the muffler clean. An imperforate arcuate blocking plate (31) is nested within the lower portion of the cartridge to permit accumulation of the spent engine cooling water within the cartridge to aid in noise reduction at certain engine speeds. The blocking plate is provided with a relief opening means (33) for assisting in water drainage upon engine shutoff.

Abstract: In a swash plate type hydraulic system such as a hydraulic pump, a hydraulic motor of the like, a group of cylinder bores in which plungers engaging a swash plate are slidably received are annularly arranged in a cylinder block, and higher and lower pressure oil passages are concentrically provided in the cylinder block. Further, a group of distributor valves are provided in the cylinder block in a radially arranged configuration for controlling the connection and disconnection between the higher and lower pressure oil passages and the group of cylinder bores by radial reciprocating motion of the valves, and an eccentric wheel is provided eccentrically with respect to the center of rotation of the cylinder block to abut against the outer ends of the distributor valves so as to impart a reciprocating motion to each of the distributor valves. A shifting device is provided for changing the eccentric relationship between the eccentric wheel and the cylinder block.

Abstract: This invention relates to a system for the generation of useful energy from the power in ocean waves. The wave power generation system is an array of individual absorber units each consisting of a buoyant raft, connected to a stable mooring assembly by means of a yoke so as to allow relative motion between the buoyant raft and the mooring assembly in response to the motion of the waves. A linkage between the buoyant raft and the yoke allows conversion of the relative motion into mechanical, hydraulic and/or electrical power. The system is designed to be responsive to the broad spectrum of frequencies present in ocean waves. The response characteristics of the individual absorber units can be changed to match the conditions of the incident waves in order to provide maximum power conversion efficiency. Each unit of the array is tuned to a condition for maximum power absorption by control of the shape, mass, moments, and power extraction impedance.

Abstract: A master cylinder for use in automotive hydraulic brake device has a pressure liquid chamber formed at one side of the larger diameter portion of the piston and a supply liquid chamber formed between the other side of the large diameter portion of the piston and a ring-shaped cup seal. The inner lip of the ring-shaped cup seal is integrally formed at its distal end with an annular projection coming into contact with a cup seal locking member, which is inserted in the large diameter portion of the cylinder and serves to prevent a movement of the ring-shaped cup seal towards the supply liquid chamber, so that the deformation of the inner lip is restrained.

Abstract: The apparatus has at least one cam plate driven by a drive shaft in a piston pump or hydraulic pressure generator. The cam plate has a cam track or surface with at least two substantially sinusoidal protrusions and recesses or depressions on its circumference or perimeter. The rotation of this cam plate drives a crankshaft of a hydraulic piston and cylinder drive unit or motor by means of at least one plunger or cam follower or tappet and a piston through at least one transmission pipeline or conduit filled with a hydraulic medium. This transmission pipeline is attached without valves to the cylinder of the piston and is connected by means of an also valveless cylinder with a piston of the hydraulic piston and cylinder drive unit or motor.

Abstract: A piston for acting on both a master cylinder and a fluid pressure booster is slidably disposed in a housing and defines a pressure buildup chamber communicating with a wheel brake actuating cylinder on one end and a power chamber on an opposite end. The cylinder has a plurality of axial slots defined in an outer peripheral surface thereof and communicating with inlet, supply, and outlet ports, there being seals disposed in the axial slots.

Abstract: A multi-cylinder internal combustion engine with two exhaust gas turbochargers of which one is adapted to be switched-in during the operation of the internal combustion engine by way of a switch-in valve controllable on the turbine side and by way of a check valve on the compressor side. Furthermore, a controllable blow-off valve (waste gate) is installed into a by-pass line which by-passes both turbines. The blow-off valve and the switch-in valve are controllable by a control apparatus as a function of condition magnitude of the internal combustion engine. The activation of the blow-off valve and of the switch-in valve is subjected to an anticipatory control dependent on condition magnitudes on which at least one charging-pressure-dependent regulation is superimposed. The regulation has advantageously a PID-like structure whereby the regulating parameters are condition-dependent. The regulation and control are additionally subjected to static as well as dynamic limitations.

Abstract: A diesel engine, in particular an aircraft engine with an exhaust gas turbocharger, which comprises a compressor and a turbine, wherein for the engine (1) a compressed air starter (20), for the engine (1), is provided whose exhaust air (31, 31') is directed via the turbocharger (4) into the combustion chamber of the engine (1).

Abstract: Methods and apparatus for ocean thermal energy conversion using metal hydride heat exchangers to power a turbine by desorbing and absorbing hydrogen gas. Heat exchangers are alternatively floated to the ocean surface to warm the metal hydride bed or sunk to the bottom to cool the bed. The turbine powers an electric generator which produces electricity which may be utilized directly, stored in a superconducting magnet, used to desalinate water, or used to power the electrolysis of water in order to produce hydrogen for use as a fuel.

Abstract: In the dual burner of a gas turbine or a hot gas generating system, the swirler (1) is formed from at least two doubly curved sheets (4, 5) subject to tangential air inlet (7). These sheets (4, 5) are folded along diagonals (10a, 10b) running conically outwards in the outlet flow direction. One curved fold face forms an inner cone (4b, 5b) expanding in the direction of the swirler outlet end while the other curved fold faced forms an outer cone (4a, 5a) which contracts in the direction of the end outlet. The inner cones (4b, 5b) each carry at their ends a fuel main (8) whose fuel nozzles (9) are directed radially inwards towards the inner zone of the swirler (1). The liquid fuel (2a, 2b) is directed onto the outer cone (4a, 5a), the oil film (6) forming there being "rolled in" by the air (7) flowing into the outer cone (4a, 5a).

Abstract: A refrigerated cabinet for the merchandising of frozen foods is disclosed as including a lower interior freezer and an upper opened top which is provided with a peripheral mount; a frost shield carried by the mount is located in spaced relation and adjacent to walls of the freezer whereby frost accumulates on the frost shield rather than on the freezer walls.

Abstract: An energy-conserving refrigeration apparatus which employs a atmospheric pressure and vacuum-pressure actuated partial compressor for a refrigerant gas in combination with a conventional prime mover-driven compressor and also achieves lower compressor head pressure and increased condenser cooling of the refrigerant gas.

Abstract: A heat exchanger for a fast cooldown cryostat having high pressure and low pressure flow paths wherein a low pressure flow path is defined by a finely divided matrix which in turn defines a plurality of flow paths and said high pressure flow path is disposed in heat exchange relationshp to said matrix.