Abstract: A figure toy, such as a doll or the like, having a torso and a head. The head has a brow and scalp portion secured to the torso by a vertical post and against rotation relative to the torso. Between the brow and scalp portion and the torso, the head includes a face section or portion mounted for rotation on a vertical axis relative to the scalp portion and torso when the doll head is considered in upright position, e.g. on the axis of said post. The face portion includes back-to-back different facial features so that on rotation the front facial features can be changed. The face portion may include a plurality of individually rotatable members. In order to conceal the facial features rotated to the rear of the head, the scalp portion is provided with simulated hair extending therefrom downwardly at the rear of the head to a position below said facial features.

Abstract: Improvements are provided in the internal framework of a stuffed bendable doll. The improved bendable framework in at least a portion of the interior of the doll consists of at least one linear framework member consisting of flexible metal wire coated with an external annular layer of flexible resilient plastic. The combination of central metal wire and annular plastic layer is preferably formed by extrusion of wire stock with in situ deposition of the outer plastic layer. The linear framework member typically extends centrally and longitudinally through a limb of the doll, so that the limb is bendable, and the terminal end of the member at the outer terminus of the limb is retroflexed so that the terminal end of the wire portion of the member is bent away from direct contact with the outer terminus of the limb. An entire internal framework of specific configuration and held together by at least one metal clip is also provided.

Abstract: A toy vehicle including a chassis member mounting an electric motor and rear wheels driven by the motor is provided. A unitary steering block is pivotally and floatably mounted at a hitching point on the front of the chassis and bears the vehicle front wheels and receptacles for floatably mounting electrical pickups. Mounted within the pick-ups are small springs which insure electrical contact to the track.

Abstract: A method is described which uses a composition including a small non-toxic amount (less then about 0.001 part per part of the composition) of a water soluble adhesive agent, particularly an alkali metal salt of carboxymethyl cellulose, with water and with nitrogen fixing bacteria for applying the bacteria on the surfaces of seeds of the plant family leguminosae or on particles surrounding the seeds including soil particles or combinations thereof. The nitrogen fixing bacteria are of a symbiotic species and are selectively isolated from effectively nodulated plants of the variety to be inoculated so that they are efficient in inducing effective root nodulation in the plants. Novel compositions are described which include the bacteria mixed with water and the adhesive agent and which are prepared by a manufacturer, frozen for shipment, and then thawed and substantially diluted with water by the farmer or other user for application.

Abstract: The arrangement for abrasive machining comprises a base member, connected with the headstock of a copy milling machine, and a casing, made in the form of a hollow cylinder, connected with the base member by articulated suspensions. Mounted in the seat of the hollow cylinder, by means of an intermediate sleeve, is a tool spindle which carries the abrasive tool. The intermediate sleeve has a spherical bearing with a flat end. The tool spindle is coupled to the rotary drive means by a flexible shaft and an intermediate shaft joined together by a splined joint. The arrangement also comprises a device for urging the abrasive tool against the surface to be machined, which includes an urging force adjustment means formed by a socket disposed in the hollow cylinder, spring-biased towards the flat end of the spherical bearing by its end and provided with a central hole for receiving the flexible shaft.

Abstract: A honing machine for honing ball bearing races or other arcuate grooved surfaces that extend around the circumference of cylindrical workpieces comprises a workpiece support assembly for rotatably supporting the workpiece in the machine, a spindle drive mechanism for rotating the workpiece, and an oscillation mechanism for holding and oscillating a honing stone in abrading engagement with the arcuate surface of the workpiece as the workpiece is rotated. The oscillation mechanism includes an oscillating tool holder for holding the honing stone and a mounting mechanism for rotatably supporting the oscillating tool holder. The mounting mechanism is tiltable by means of a lift cylinder and toggle linkage to lift the stone out of engagement with the grooved surface of the workpiece for insertion and removal of successive workpieces into and out of the honing machine.

Abstract: A machine for successively grinding and polishing tools such as gravers of hard metal has grinding and polishing wheels mounted in parallel shafts on a support which can be moved to bring either wheel to face a tool held in a workpiece holder. The polishing wheel can be moved to an extreme position which is precisely set by a micrometer screw so that it comes to occupy exactly the same position formerly occupied by the grinding wheel. Alternatively, the workpiece-carrier can be moved by a cam system to exactly position the tool against the two wheels.

Abstract: An apparatus for preventing circumferential overspeeding of a grinding wheel is provided in which first and second rejection members, pivotably carried respectively on a motor base and a wheel head, are connected with each other through a transmitting mechanism. The mechanism is arranged to prevent, by the first rejection member, the attachment of a large diameter pulley to a motor on the motor base when a grinding wheel with a maximum useable diameter, or one having a diameter greater than a predetermined pulley exchange diameter, is on a wheel spindle of a wheel head, without interference with the second rejection member. A parallel motion mechanism is incorporated in the transmitting mechanism so that the same may transmit pivotal movement of the first rejection member to the second rejection member without being affected by movement of the motor base on the wheel head.

Abstract: A floor sanding machine is provided with a pair of sanding discs, each of which is driven by an individual variable speed electric motor. Individual controls on the handle of the floor sanding machine control the speed of each of the individual motors so that the sanding machine can be guided in a desired direction by changing the speed of one or the other or both of the electric motors.

Abstract: The building construction disclosed employs precast elongated T-shaped elements (Tees) and/or modifications thereof. Vertical tiers or ranks of Tees are erected in side by side spaced relation one to the other. The stems of the Tees form opposite side walls of internal cells with the flanges of the Tees forming floors and ceilings. When employed, modified or half Tees are disposed in side by side relation and superposed one over the other to form vertically aligned hallways and elevator lobbies. An elevator tower is provided by a pair of modified Tees disposed on their ends to form a vertically extending channel with their stems attached to the elevator lobby Channels. The Tees are secured by welding, post tensioning devices or both. Several variations in construction employing the aforementioned construction elements are also disclosed.

Abstract: Liquefied gas is stored in a large rigid or semirigid cylindrical container. Between the walls and floor of this container and the walls and floor of an outer container, which may be an earthen cavity in which the container rests, is distributed a continuous layer of insulating material such as perlite or vermiculite in granular form. This insulating material serves as the sole means of support for the rigid or semirigid container and the liquefied gas stored therein. An impediment is included in the construction near the intersection of the floor and side wall of the rigid or semirigid container, the impediment completely encircling the container to substantially limit the cross-sectional area through which the granular insulation material may flow upward. By confining this cross-sectional area, the creep or migration of insulation material from beneath the container during initial filling, repeated filling and emptying of the liquefied gas contents of said container is substantially reduced or eliminated.

Abstract: An anchor assembly includes an elongate base means that has a tie-down member for operatively engaging the back end of the base means to attach it to a support, a brace member operatively engages the base means and extends upwardly thereof so that a flexible stress member can operatively engage and extend between a back end of the base means, an upper end of the brace member and the front end of the base means so that a second stress cable or chain to be anchored can engage the first stress member intermediate the upper end of the brace means and the front portion of the base means to extend therefrom to engage the work object.

Abstract: The wall structure is comprised of a building panel which includes U-shaped side members each having a web portion and outwardly disposed spaced apart flange members with a plurality of sheet members extending between the web portions of the side members. The sheet members dwell in the same plane and the adjacent edges of the sheet members may be spaced from each other. Pairs of stiffener members extend between the side members on opposite sides of the sheet members and cover the adjacent edges of adjacent sheet members. The stiffener members have a beveled outer surface so that particulate material will not lodge thereon when the panel is in a vertical position. The stiffener members form an enclosed compartment along the adjacent edges of adjacent sheet members.

Abstract: The invention provides a structural assembly for use in a building comprising a pair of strip elements which form adjacent horizontal and vertical sides of a frame and a corner piece joining said two strip elements together, said corner piece comprising a hollow body, formations at right angles to each other on said hollow body providing respective spigot-and-socket connections with said two strip elements, said body of said corner piece having a moisture retaining wall arranged so that moisture draining from one of said strip elements into said corner piece, on that side of said moisture retaining wall which includes the spigot-and-socket connection for the strip element which provides said vertical side of said frame, is contained therein by said wall.In the preferred construction, said moisture retaining wall comprises an internal web substantially dividing one part of the interior of said corner piece from another part.

Abstract: A prefabricated panel of substantially uniform width and thickness and having an interlocking feature comprises a foamed core slab, a rigid facing sheet bonded to the foamed core slab, and flange members integral with the facing sheet which interlock adjacent panels of the same type. Optionally, a heat-reflective liner is provided on the back side of the core slab.

Abstract: A plastic or metal web is provided with upper and lower projecting truncated conical members with a surrounding edge band having a thickness equal to the conventional mortar joint between brick or block courses. It is placed on the last laid course with the downwardly extending members frictionally engaging within the apertures in the bricks or blocks. Mortar or other adhesive may be used if desired and the next course is then laid engaging the upwardly projecting members. The spacing of the projecting members is such that the bricks or blocks are aligned spaced and reinforced thus facilitating laying of the bricks or blocks.

Abstract: A method of erecting a building which comprises installing internal, panel-like forms; mounting a metallic reinforcing mesh spaced from said walls and thereafter spraying a concrete or other settable mass onto said formwork and reinforcing mesh to incorporate the form and mesh into a wall with the concrete. In the building of a house, the formwork and reinforcement can be erected as, for example, a foundation or other lower level and thereafter the walls and floors of the upper levels may be disposed upon that form. Only subsequently need the spraying of the concrete onto the reinforcing mesh be completed.

Abstract: A method of overcoming the problem of water seeping into the basement of a dwelling or other structure includes procedures for treating a hollow basement wall and for treating the footer drainage tile system which extends perimetrically around the basement wall footer. Wall treatment is effected by pumping a hardenable filler material, in fluid form, into the hollow wall to fill and seal the hollow wall portions as the filler material hardens. The filler material also operates to fill and seal cracks formed in the outer surface of the wall.

Abstract: Plastic netting, particularly for wrapping pallet loads, securely to hold the load on the pallet without heat-shrinking of the netting and providing for ventilation of the load, i.e., egress of air from the load or ingress of air to the load; a method of wrapping the load with such netting for such purpose; and the resultant wrapped pallet load.

Abstract: An inflater sealer machine is disclosed which clamps the open upper portions of a flexible container, fills the package with a quantity of gas, and subsequently seals the upper container portions closed. The clamping means of the machine comprises a pair of clamping members capable of moving together to hold the upper portions of the container together. The inflating means includes a tube which extends through the clamping members into the open upper container portions. The sealing means comprises a pair of sealing members adjacent to the clamping members and capable of moving together to seal together the upper portions of the container while the container is inflated. A pneumatic control system, including a "piggy-back" pneumatic cylinder, is also disclosed for controlling the sequential actions of the clamping, inflating, and sealing means.

Abstract: A container blank is encoded on all flaps thereof in manner providing for presentation of the same coded pattern to a sensing unit irrespective of the flat registered with the sensing unit. The sensing unit is connected through article-designator apparatus to an indicating unit which is energized exclusively when the sensing unit indicates container blank article indication not conforming the article setting of the article-designator apparatus.

Abstract: An improved method for automatically producing a selected weight draft of sliced product from a workpiece in substantially uniform weight slices and in an integral number of slices.

Abstract: A tubeless vertical form, fill and seal packaging machine has a tube former for receiving flexible packaging material in thin flat strip form and juxtaposing opposite longitudinal edge portions thereof in parallel vertically extending relationship to provide a depending tube open at the top. Side and end sealers respectively seal vertical longitudinal edge portions and provide vertically spaced horizontally extending end seals across the tube. A product dispenser discharges measured quantities of product into the tube interior through its open upper end. Improved tube feed means comprises first and second pairs of vertically spaced rolls respectively on opposite external sides of the tube of packaging material and first and second tube feeding belts respectively trained over said pairs of rolls. Inner runs of the belts engage the tube and have vertically extending imperforate marginal portions and a perforate intermediate portion.

Abstract: A saddle pad for use in connection with riding saddles is disclosed, including a base portion, a pair of side panels depending from the base portion, each of the side panels including an outer layer and an inner layer, and slot means in said outer layer so that the panel portion of a riding saddle may be inserted into the slot means and between the outer layer of the side panel and the inner layer of the side panel to stabilize the saddle pad during use.

Abstract: A peanut combine is provided with an improved thrashing or picking system having longitudinally spaced thrashing cylinders rotating at different speeds in combination with vine flow control apparatus for directing the vines through the thrashing chamber and for intercepting the vines as they are moved by the cylinders to cause greater shredding of the vines and more efficient detachment of the peanuts from the vines.

Abstract: A closed-loop height control for the header of a combine harvester permits adjustment of height setpoint and deadband from the operator's platform without stopping the combine. A variable capacitance is rotated in accordance with minimum clearance between header and ground to generate a continuous electrical header height signal which is compared to a setpoint signal indicative of desired header height to derive a height error signal whose value is at a null level when actual header height is equal to desired height indicated by the setpoint signal and which deviates in both magnitude and direction from the null level as a function of the variation between actual header height and setpoint height. Raise and lower command signals are derived in response to a predetermined deviation of the height error signal in opposite directions respectively from the null level by first and second Schmitt trigger circuits having switching levels which respectively are greater than and less than the null value.

Abstract: Apparatus for harvesting vegetable heads is disclosed. A sensing means including a pair of parallel, laterally movable, head-engaging units, which are counter-rotated, is fixed to a frame. A cutting means is mounted on the frame and is responsive to the sensing means. The cutting means includes a horizontal knife blade rotatable 180.degree. for each head cut. The severed head is removed from the cutting area by a pair of counter-rotating lifter belts.

Abstract: An improved adjustable feeder finger assembly for a hay baler is disclosed. The improved assembly is comprised generally of three elements, i.e., a bracket for affixment to a driven element of the infeed mechanism, a feeder finger, and means to hold the two together. Frictional mating surfaces on the bracket and finger insure that the selected relative relationship between the two elements is maintained during operation.

Abstract: Method of determining incorrectly operating spinning stations of a spinning machine which includes counting with counting means for each spinning station the number of anomalous interruptions of the operation thereof, interrogating at the time intervals the count at the respective counting means with an operating device capable of traveling relatively to the spinning stations, and issuing a fault signal automatically if a predetermined count of the respective counting means for the spinning stations is reached or exceeded, and device for performing the foregoing method.

Abstract: A continuous twisting and cabling machine including a yarn feeding and twisting section and a cabling and rewinding section positioned below the twisting section. The twisting section includes a series of removable assemblies supporting a series of twist spindles, control and brake means for the spindles, connecting means to a transporter and fixing means for attachment to the cabling and rewinding section.

Abstract: A compensator for correcting any time gain or loss in the minute and hour hand works in a time-keeping mechanism, wherein signals are received and converted into first and second electrical signals at predetermined time intervals, includes a servo unit for receiving the electrical signals. Upon receiving the first signal, the servo unit drives a first lever to contact and drive a first pin to a first position, and upon receiving the second signal, the servo unit drives a second lever to contact and drive a second pin to a second position. A first clutch is fixed to the first pin and is adapted to uncouple the minute and hour hand works from the mainspring assembly when the first pin is driven to the first position and to drive the minute and hour hand works to a first time setting.

Abstract: An electro-mechanic calendar timepiece includes a braking device for generating torque to prevent drifting or floating of the movement gearing when the intermittent calendar driving mechanism is not rotating. When the calendar driving mechanism is rotating the braking device is not operating and the calendar driving mechanism cooperates with a lever arm and spring to generate torque to prevent the floating of the movement gearing.

Abstract: A sealed watch case comprises an assembly wherein a gasket bead is applied to predetermined locations on the watch case and caseback prior to assembly. The gasket bead consists of a plastic or elastomeric material generally polymeric in nature which is applied in the form of a gasket bead to the crystal seat in the watch case, the caseback seat in the watch case or either predetermined locations in the caseback. The bead provides a fixed, formed in place and flexible gasket arrangement between the components of the watch case assembly to prevent entry of foreign matter into the watch case. The bead becomes an integral part of the watch case assembly, yet disassembly does not impair the effectiveness of the bead upon subsequent reassembly.

Abstract: The blades of a gas turbine are primarily cooled by the circulation of a coolant through the hollow interiors thereof by the thermosiphon principle. Each hollow blade interior is also placed in fluid communication with a secondary coolant source, but secondary coolant flow is precluded by a plug filling the inlet fluid passage. Similar plugs fill apertures in the form of casting holes through each blade airfoil portion, the holes serving to discharge the secondary coolant from the blade interior. The plugs are fabricated of a material having a lower melting point temperature than that of the remainder of the blade airfoil portion such that, in the event of failure in the primary cooling system, the plugs will melt, thereby permitting the secondary coolant to rush through the blade and provide internal cooling thereof.

Abstract: A thrust control system is provided for varying the thrust output of a gas turbine engine. The system is adapted to control the thrust output of the engine in a first mode in accordance with at least a pair of thrust-indicating parameters. The system is further adapted to control thrust output of the engine in a second mode in accordance with one of the thrust-indicating parameters.

Abstract: An infrared radiation suppressor secured to the discharge end of a gas turbine engine has a series of movable vanes maintained in an open trailing edge configuration in which they form converging flow passages for the gases emanating from the gas turbine engine and passing between the vanes, thereby decreasing the gas static pressure at the vane trailing edges below ambient levels. Flow passages in heat exchange relationship with the duct walls of the suppressor carry ambient air through the passages to a point downstream of the vanes. The lowered static pressure at this point causes ambient air to flow through the passages and into the gas stream, thereby cooling the duct walls and the gas stream. The hollow center of the movable vanes are also open to ambient air at the outer ends. The lowered static pressure at the vane trailing edges also causes large quantities of ambient air to enter into the hollow vanes and out the trailing edges into the gas stream further cooling the gases.

Abstract: A transfer system having a transfer mechanism which is located directly on or adjacent the production machine. The transfer mechanism comprises a reciprocating workpiece shuttle driven by a hydraulic driving unit, specifically a hydraulic transfer cylinder. The latter is connected to a remote hydraulic cycloidal drive unit by long conduits which may be positioned overhead. The remote hydraulic cycloidal drive unit employs a pumping cylinder having an elongated stationary piston rod on which the cylinder housing is slidably supported, with the pressure fluid from the pumping cylinder being supplied through the conduits to the transfer cylinder. The housing of the pumping cylinder is reciprocated by a crank associated with a cycloidal mechanical drive. This crank is connected to and rotates with a gear which is rotatably supported on a slide and reacts with a stationary rack so that reciprocation of the slide causes alternate rotation of the gear.

Abstract: A hydraulic pile driver of the kind having at least one hydraulic cylinder for raising a tup. An arrangement is proposed for allowing the use of oil as the hydraulic fluid. The cylinder has a closed chamber around it, to which oil under pressure is supplied. An apertured cuff around or within the cylinder is moved to bring its apertures periodically into and out of registry with apertures in the cylinder wall to connect the cylinder space alternately with said chamber for supply of fluid to the cylinder and to a discharge line for the discharge of fluid from the cylinder. The volume of the chamber is considerably greater than the volume of the cylinder space. The apertures in the cuff and the cylinder wall that register for discharge of the oil from the cylinder have a total cross-sectional area at least equal to that of the cylinder space to make for fast discharge of the oil, thereby ensuring free fall of the tup.

Abstract: The unit comprises outer and inner coaxial cylinders defining an hydraulic fluid reservoir between the inner walls of the outer cylinder and the outer walls of the inner cylinder. The opposite ends of the cylinders are closed off by a lower closure means and an upper cylinder head. A single piston within the inner cylinder has first and second piston rods extending from opposite sides through the cylinder head and lower closure. The cylinder head includes an hydraulic pump with passages placing the reservoir into communication with the interior of the inner cylinder above the piston together with appropriate check valves so that operation of the hydraulic pump will move the piston down the inner cylinder to exert a pulling force on the first piston rod and a pushing force on the second piston rod.

Abstract: A hydraulically operated driving and controlling unit includes a power plant--(prime mover)--with a fluid flow producing means for the supply of at least one pair of hydraulic flows of equal rate of flow. One separated fluid line is exclusively communicated to one outlet of the flow producing means and to one hydraulic motor. A further separated fluid line is exclusively communicated to another outlet of the flow producing means and to another hydraulic motor. The motors carry fluid stream creation means like propellers. The said flows flow through said fluid lines to drive the said motors and fluid stream creation means at all times with, relative to each other, equal rotary velocities for the creation of equal thrusts by said fluid stream creation means. The flow supply device may be variable for proportionate variation of the said rotary velocities and thrusts. In addition a further control means is provided for governing variation of rotary velocities and thrusts relative to each other.

Abstract: A Stirling type engine having a cylinder provided with a heated end, containing a displacer plunger, and an opposite end containing a power piston, with a cold space between the plunger and the piston. Normally closed, valved exhaust and inlet ports connect to the cold space. After the usual step of the heated gas from the cylinder heated end portion expanding and driving the displacer plunger and piston and then entering into the cold space, such heated gas is exhausted from the cold space and the cold space is replenished with fresh gas before the next usual step of the piston and plunger moving towards each other for the compression of and the movement of the gas from the cold space into the cylinder heated end portion.

Abstract: Apparatus for establishing a solid, very low permeable rock glass plug to seal access holes through rock to underground storage vaults. The apparatus is designed to supply a filler material having a constituency substantially matching that of the rock formation surrounding the access port to the vault, through a central feeder tube under pressure to the vault. Means are provided for heating the filler material and surrounding rock formation at the point where the filler material exits the feeder tube, to a temperature sufficient to melt both the rock formation and the filler material. The remaining portion of the feeder tube is cooled to preserve the surrounding rock formation spaced from the feeder orifice. The melt at the extremity of the feeder tube is forced through the orifice to a region below the tool by the force of the pressure feed. As the melt is forced below the tool, the tool is retracted until the access hole is completely sealed.

Abstract: This disclosure describes a dielectric refrigerator using orientable defect dipoles and operating between a high temperature, T.sub.h reservoir illustratively supplied by a Stirling cycle refrigerator (8.degree. K .ltoreq. T.sub.h .ltoreq. 20.degree. K) and a low temperature, T.sub.1, load, illustratively the liquid He cooling fluid for Josephson junction or other superconducting devices (2.degree. K .ltoreq. T.sub.1 .ltoreq. 6.degree. K).Exemplary practice of this invention provides cooling from the limit of a refrigerator based on the Stirling thermodynamic cycle (20 to 8.degree. K) to operating temperatures of common and useful superconductive devices (3 to 6.degree. K). Orientable electric dipoles of defects in electrically insulating materials, e.g., crystals, are utilized to provide cooling in the range from (8-20 K) to (2-6.degree. K). The following are particular considerations concerning the practice of this invention: use of LiF, MgO and BeO as host crystals; use of OH and/or NH.sub.

Abstract: The invention relates to apparatus maintaining extremely low and constant temperatures. The helium 3 (He.sup.3) cryostat is disposed inside a portable helium 4 (He.sup.4) cryostat which is constituted by a Dewar jar 2 with helium 4 at 6. The helium 3 cryostat comprises an evaporation chamber 11, a reservoir 13, an adsorption chamber 16 with an adsorbent 17, two pipes 15 and 18 and a valve 20. Particular applications in conjunction with a bolometer, the sensitive element of which is shown at 26.

Abstract: An ingot as descending from a mold for continuous casting is cooled by several revolving spray jets.

Abstract: A control system for a refrigeration system having an air-cooled condenser exposed to normal year round ambient temperatures. Head pressure is controlled in response to sensed subcooling of the refrigerant in the liquid line near the entrance to the expansion device, so as to prevent the occurrence of flash gas at the expansion device, while still allowing minimum head pressures so as to improve energy efficiency. In alternate embodiments, additional controls are provided for assuring at least a predetermined minimum pressure differential across the thermostatic expansion valve. In one preferred embodiment a two-bulb sensing technique is used for subcooling and pressure differential sensing. Both series and parallel condenser-receiver connection systems are disclosed, as are a number of different subcooling sensing and control embodiments.

Abstract: In a self-contained air conditioner unit of the reversible type having cooling and heating cycles, a no-drain heat pump is provided wherein in the cooling cycle condensate water collected on the indoor heat exchanger operating as an evaporator is transferred to the outdoor section of the unit where it is atomized and directed through the relatively warm outdoor heat exchanger operating as a condenser. In the heating cycle, water collected on the outdoor heat exchanger operating as an evaporator during heating is transferred to the indoor section. The condensate is directed into the air flow circulating through the indoor section where it atomizes and passes through the relatively warm indoor heat exchanger to humidify the air.

Abstract: Rotary thermodynamic compression and refrigeration apparatus and methods in which the mechanical impedance and/or thermodynamic impedance of the system are controlled in order to obtain stable operation. By controlling these impedances, the overall pressure drop of the fluid flow in the system is made to increase with increasing fluid flow rate, thus ensuring stable operation.

Abstract: A .sup.3 He-.sup.4 He dilution refrigerator is provided with two interconnected mixing chambers arranged at different levels. One end of a superleak opens into concentrated .sup.3 He contained in the upper mixing chamber, while the other end opens into a portion of the apparatus containing dilute .sup.3 He for the supply of superfluid .sup.4 He, via the superleak, to the upper mixing chamber under the influence of the osmotic differential pressure prevailing across the superleak.

Abstract: Fitting yokes are coupled each by a universal joint of the trunnion type to the opposite ends of a shaft assembly biased for axial extension. Each of the fitting yokes has a sleeve inserted in a center bored portion of the universal joint with a clearance formed therebetween to permit relative angular displacement between the axis of the shaft assembly and the axis of the fitting yoke. The drive shaft therefore has a greatly reduced length in its entirety. The shaft assembly includes a splined portion adapted to permit collapsing and extension of the assembly and circumferentially covered with a sleeve-shaped cover. The cover defines an interior space holding a lubricant to lubricate the spline portion for sliding movement.