Abstract: A vehicle having four LDRs (light dependent resistors) on the upper surface thereof has a first motor for driving the vehicle in a forward or reverse direction and a second motor for turning the vehicle in a rightward or leftward direction. Selective light illumination on LDRs causes the vehicle to be propelled in a forward or reverse direction or to turn in a right or left direction. A selected LDR pair may be illuminated simultaneously to cause the vehicle to move forwardly and rightwardly; to move forwardly and leftwardly; to move rearwardly and rightwardly; and to move rearwardly and leftwardly. The LDRs may all be sensitive to the same radiation frequency range or may be responsive only to radiation frequencies in mutually exclusive ranges. A manually operated radiation frequency generator is used to illuminate the LDRs and control the car direction movement. The generator may have a single band of frequency ranges or may have specific limited and mutually exclusive radiation frequency bands.

Abstract: A wire clip for direct attachment to individual bricks of a masonry wall as a support and/or guide for climbing plants growing along the wall. The clip is a unitary wire member bent to the desired configuration and has a pair of opposite angular bent end formations and an intermediate outwardly projecting return bent formation which defines a loop when installed. The clip is slightly bowed and is spreadable so that the end formations engage opposite parallel longitudinal sides of an individual brick of the masonry wall with the clip disposed across the face thereof and the vine stem passing through the loop. Installation is effected by application of thumb pressure to the loop; disengagement can be effected by applying leverage thereto, all without any residual damage to the wall since installation does not involve digging into the brick or mortar.

Abstract: The bowden cable drivingly connecting a crank on a motorcar door to a carrier for the window in the door has a plastic compression member whose ends abuttingly engage retaining members near the crank and the window carrier. The ends are of noncircular cross section, and their angular movement about the longitudinal axis of the cable is prevented by conforming engagement with respective retaining members.

Abstract: Apparatus and a method for removing images which are disposed on a surface of a film section, such as a microfiche card. The apparatus comprises a housing in which a motor-driven, rotary abrasive wheel is disposed. A carrier tray is provided to support the film section to be treated and is arranged to carry the film section into the housing under the wheel so that the rotating wheel scrapes the surface of the film, thereby removing the image. A fan and filter means are provided in the housing to trap the particles produced during the image removal operation, to thereby preclude the egress of such particles to the ambient atmosphere.

Abstract: An improved grinding method and apparatus is advantageously used to sequentially grind the pins of a crankshaft. During the grinding of each crankpin, the pin is supported by a steadyrest. During an initial grinding operation, the crankpins are measured or gauged to determine if they are out-of-round by an amount which is greater than the tolerances for the finished crankshaft and less than a maximum amount. If a crankpin is out-of-round by an amount which is equal to or greater than a maximum amount, the crankshaft is rejected. However, if a crankpin is out-of-round by an amount which is less than the maximum amount and more than the tolerances for a finished pin, a second grinding operation is initiated after the initial grinding operation has been completed. During the initial and second grinding operations, a main drive motor is effective to press the steadyrest against the crankpins.

Abstract: A method and apparatus for the treatment of products, such as for mixing materials, in which the products are introduced into a chamber having a spiral treatment path, a central inlet and a peripheral outlet and disposed in a horizontal plane, the products being subjected to vibratory movement to constrain them to travel along and around the spiral path from the inlet to the outlet.

Abstract: A machine device for generating a convex surface, especially for the formation of the front surface of a cabochon, inherently symmetrical without irregularities and in a range of sizes both spheroid and ovoid, and comprising a manually operable dop-stick to which workpieces are replaceably attached to be shaped about two selectively distinct radii, by advanceably offering the workpieces into grinding engagement with an abrasive wheel.

Abstract: A greenhouse having a ridge member of hollow section with a T-slot in its underside from which T-bolts depend for the connection of corner jointing brackets to which endmost glazing bars are bolted.

Abstract: A building panel in which transverse beam segments bracing primary beams or studs are comprised of particle board. Also disclosed is an assembly of panels in which the panels are coupled by bridging a plurality of transverse beam segments in pairs by means such as respective gang nail plates. Finally, a method of construction entailing an site cutting and assembly of extended panels is described.

Abstract: A building frame construction for a light metal building. The frame utilizes a series of transverse sub-frame assemblies forming side wall columns and main roof beams. Purlins and girts extend longitudinally between and are attached to the sub-frames to provide support for the side wall and rool panels; end wall columns and girts are provided to support the end wall covering. Each sub-frame comprises a plurality of modular truss units which are interconnected to form the unitary assembly of the sub-frame. Each truss unit comprises two main beams interconnected by struts and braces; the main beams are each formed from two angles aligned in a facing relation with a slot down the middle to permit attachment of any number of purlins or girts at any point along the beam.

Abstract: A first wheeled trailer means includes support means for supporting a mast and drawworks thereon and a second wheeled trailer means includes an upright structure for supporting the mast in upright positon to conduct well operations. The second trailer means also includes ramp and platform means to receive and position the first trailer means thereon in elevated position whereby the mast may be pivotally engaged with the upright structure of the second trailer means so that thereafter the mast may be raised to an upright position for conducting well operations. The first and second trailer means also include cooperating means to position and secure them together to form a base substructure support for the elevated mast and the drawworks while the well operations are performed.

Abstract: Three-dimensional structures made of open or closed profiled metal beams and plates are disclosed. Said structures comprise a plurality of parallel frame beams connecting the side flange junctions with respective joists and connecting the top flanges of the frame beams with plates. The structure is divided into frame beams modules easily fabricated in factories and easily transported and then joists are fit at the construction site, thereby resulting in a high degree of prefabrication and shortened installation time.

Abstract: A panel of molded plastic or cured composite materials configured to span the space between a pair of beam or support members by a slideable engagement between each of the opposite ends of the panel and its adjacent beam or support member, and the panel sealingly and lockingly engageable along each of its opposite edges to another panel adjacent each edge of the first panel. The panels are fabricated whereby the panel end engagement means with the beam or support members define a predetermined path which in turn is variable as the panels can be arcuately flexed widthwise upon installation engagement with the beam or support members while at the same time minimizing load deflection of the panels lengthwise when installed.

Abstract: The specification discloses a prefinished vinyl wall system for modular construction in an office building and a method for installing the same. Prefinished wall panels are dimensioned to abut with one another along their lateral edges. The panels are cemented to C-beams located just behind the panels on both sides of the joint. Staples are inserted along the lateral edges of each panel to engage a freely floating T-section disposed behind the joint formed by abutting panels to retain the panels in alignment until such time as the panels are permanently secured to the C-beams. The exterior portion of the lateral edges of each panel are beveled to form a V-junction on the finished side of the panels at the joint to give the panels a professional, workmanlike appearance.

Abstract: A preformed structural member that includes an elongated web having first and second flanges projecting laterally from its two longitudinal edges. Each of the flanges is of different construction, however, the flanges of two or more members can be interlocked to form either a right angle corner sections or continuous flooring or ceiling sections. Similarly, the member can be easily snapped into operative relationship with flat panels to create a self-standing sub-assembly possessing sufficient holding power to temporarily support the cojoined components until such time as they can be more securely locked together in final assembly.

Abstract: Device for inserting tape cassette or the like and enclosures particularly into hinged boxes, having devices for feeding the boxes, for opening the boxes, for feeding and inserting the cassettes and enclosures into the open boxes and for closing and pushing out the filled boxes and having a revolving head with holding devices for the boxes. The holding devices for the boxes are arranged at the periphery of the horizontally revolving head and the holding devices hold the boxes tangentially to the periphery of the revolving head. The axis of rotation extends horizontally from the cover and bottom of the boxes and is directed tangentially to the periphery of the revolving head. The holding devices have non-stationary devices rotating together with the revolving head for opening and closing the boxes during the rotation of the revolving head.

Abstract: Apparatus for supporting a roll of sheet stock and for applying end caps at opposed ends of the roll. The device includes rotatable, axially shiftable end assembly means positionable selectively to accommodate rolls of different overall lengths. Means are provided for holding capping discs in position preparatory to shaping or forming the discs into end-capping elements.

Abstract: A carton filled with a chain of interconnected open bags arranged in a plicated array is disclosed. A process for filling the carton is disclosed in which the chain of bags is fed into an inverted container, closed end first, with the bags being laid in horizontal layers. Each layer is folded back on the preceding layer to produce a plicated array.At the completion of carton loading, the trailing edge of the web preferably is fed along one end wall of the container and out an opening near or at what will become the top of the container. The container is then closed and inverted. The first bag in is the first bag out and it is positioned adjacent to a dispensing opening. The last bag in, which will be the last bag out, also projects exteriorly of the carton and is fixed in place as by taping it to the side of the carton.The plicated array has alternate folds spaced inwardly from the ends of the container.

Abstract: Packaging apparatus for making vacuum or gas-filled packages of the type including a flanged cup-shaped receptacle with a closure film sealed to the flanges and stretched down into the cup to engage and press against the product. The apparatus comprises a first packaging station where the film is sealed to the cup flanges part way around the cup mouth; simultaneously the film is heated in pre-selected locations to soften it for subsequent stretching. In a subsequent station, the partially-completed package is placed in a vacuum chamber and evacuated. Thereafter, a plug is driven against the still heated film, to force it down into the cup interior adjacent the product. Before or after the plug movement, the film is fully sealed to the cup, to make a hermetically-sealed package.

Abstract: An envelope-type pouch is divided into two compartments by a divider panel which is disposed between and is sealed to the two side panels of the pouch. The top margin of the divider panel and the top margin of one of the side panels are disposed above the top margin of the other side panel to facilitate opening of the pouch by an automatic packaging machine. Sealing of the upper end of the pouch is effected by first sealing the top margin of the divider panel to the top margin of the one side panel and then by sealing the top margin of the other side panel to the divider.

Abstract: An apparatus for cutting textile strands and forming the cut strands into bundles including a means for supplying the textile strands. A means for positioning the textile strands funnels the textile strands into a grouping of substantially parallel strands having a substantially cylindrical cross-section. A means for wrapping the parallelly arranged strands places a wrapper of paper around the strands and secures it by adhesive. A capstan guides the parallel strands to an accumulator pipe which has at its end a means for cutting the strands. The strands are held and retained so that a blade can cut them and the ends of the strands of the bundle are joined by adhesive or heat. An adhesive strip is tangentially attached to the sides of the bundles so that they may be wrapped around a rotating shaft.

Abstract: A disc mower which is silent in operation and simple to maintain. The mower comprises a casing (1) on top of which is mounted at least one pair of rotatable cutter discs (8) driven by a belt transmission (9) housed within the casing (1). The casing (1) has a base portion (3) and an upper portion (2) hingedly connected together along one edge and releasably secured together by a plurality of skids (33-37) which in use are contactable with the ground to support the mower.

Abstract: An attachment is provided for the end of the drive shaft of the motor of a rotary lawn mower, edger, trimmer or the like which comprises an elongated member that extends transversely of said drive shaft and carries at each end a rigid container having removably disposed therein a spool of non-metallic cutting line which extends from the spool and through the rigid container into the cutting plane, means being provided whereby the spools, which are oppositely disposed with respect to each other, may be easily and quickly made capable of either free movement or secured thereagainst; with the spools capable of quick and easy replacement when such is found necessary or desirable.

Abstract: A machine for winding a filament, such as wire, on a normally stationary mandrel, the machine having a single winding element provided with guides for forming a filament loop on one side only of a rotational axis. Non-rotating feeding means supplies the filament to the rotating loop and means are provided for removing the turns from the mandrel. A binding or positioning element is fed from a supply located outside the zone of rotation of the winding element, the binding or positioning element being fed down inside the filament coils to secure them for removal from the mandrel. The binding or positioning element may be a wire or a solid rod supported by an extension of the mandrel which projects towards the filament feed. The mandrel extension may be an enlongated tube mounted in bearings in one or more fixed supports between the winding element and the filament feed.

Abstract: The false twist machine has a texturing part arranged below heat treatment zones in which three supply devices and a false twist device are superimposed and staggered from the back to the front in such a manner that in threading in of the thread into these devices turning about and overhead working processes of the operator are avoided. The thread paths formed by the threading in are placed one in front of the other in the sequence of the threading in process. A bobbin creel is movable to the texturing part and is equipped with a thread transfer device which transfers the threads coming from the individual creel bobbins into the vicinity of the first supply device. The winding device is arranged opposite the texturing part at a distance forming an operating alley and gives off the full bobbins to the outerside of the winding device opposite the operating alley. The empty bobbins can be moved from the machine end into a readiness reserve position.

Abstract: A method and apparatus for cleaning fibrous material which is fed in the form of a sliver by a delivery device to an opening roller carried within a housing which opens the fibrous material and feeds the opened fibers to an open-end spinning device. A dust separator opening is provided in the housing between the delivery device and the open-end spinning device. A source of suction is connected to the dust-separator opening and a gauze-like covering extends over the dust-separator opening for maintaining the fibrous material within the effective range of the opening roller as the fibrous material is carried thereover during the opening process. The dust from the fibrous material is withdrawn through the gauze-like covering and the dust-separator opening by the source of suction. The housing can also be provided with a trash separator opening having a separator edge positioned adjacent thereto for separating trash from the fibrous material simultaneously while the dust is being removed therefrom.

Abstract: An electronic alarm watch including an oscillator for developing a repetitive time standard signal, a dividing circuit for dividing the time standard signal to develop repetitive output signals, and a counting circuit receptive of one of the repetitive output signals of the dividing circuit for counting the same to develop a count representing passage of time. A first waveform shaping circuit receives the output signal of the counting circuit and a higher repetition rate output signal of the dividing circuit for developing a pulse signal at a repetition rate equal to that of the counting circuit output signal and having a pulse width equal to that of the dividing circuit output signal. A coincidence detector detects when the count of the counting circuit and an alarm time signal coincide and develops an output signal in response to this condition.

Abstract: The present invention relates to a numerical display having a reduced dc current requirement per character display site. The invention is applicable to a variety of numerical displays including seven segment and 4.times.7 matrix displays using light emitting diodes, and low voltage incandescent segmented units designed to replace light emitting diode displays. A practical application is for displaying time in an ac powered clock or clock radio in which it is desirable to keep the dc current requirement of the display to a substantially constant minimum suitable for use with a low cost, transformerless power supply conventional with radio receivers. The current requirement of a character display site is reduced over that of full parallel operation by selectively serializing certain light sources in a manner leaving the display control circuitry uncomplicated by permitting each light source state to be controlled by a shunt control switch sharing a common bus. Since a seven segment display may assume 2.sup.

Abstract: A watch movement construction, in which a circuit board is mounted on one surface of a base plate and has a cutout formed at a position near an outer circumference of the movement construction to accommodate a battery in a position such that a circumferential periphery of the battery is partially aligned with the outer circumference of the movement construction whereas a calendar display member is disposed between another surface of the base plate and a time dial at a position displaced from a central portion of the base plate so that a line passing through a center of the battery, a center of the base plate and a center of the calendar display member makes an obtuse angle whereby the calendar display member and the battery are substantially not in an overlapping state thereby to reduce the thickness of the movement construction.

Abstract: A digital electronic timepiece comprises oscillator means for generating reference clock-pulse signals, a plurality of counter means of successive stages for successively counting the reference clock-pulse signals and respectively producing output signals for displaying numerals at respective digit positions for seconds, tens of seconds, minutes, tens of minutes, hours, and tens of hours, means for digitally displaying time in response to signals for output display of the counter means, and means for supplying a time correction reset signal to the counter means for producing as output signals for display at the digit positions respectively for seconds, tens of seconds, minutes, and tens of minutes. The time correction reset signal resets the counter means for seconds, tens of seconds, minutes, and tens of minutes so that the output signal thereof becomes a signal for "O" display.

Abstract: A regulator comprising two limiting members in the form of a blanked and bent tongue of a lug and of a detachable part serving as a pin or key, respectively. Part of the side surface of the tongue bent at a 90.degree. angle projects to form a banking. The detachable limiting member, which can be rotatingly adjusted about its axis, is fitted in the entrance opening of a cut-out portion and includes a projecting edge constituting the other banking. The two bankings are visible from above between the side surface of the bent tongue and the entrance opening of the cut-out portion so that the regulation of the beat of the balance-spring can be checked under a microscope.

Abstract: An input key positioning assembly for use in an electronic device having multi-input terminals therein. An input key formed with a flange is secured in a stepped opening in a first member so as to be downwardly and upwardly movable between the stepped portion of the first member and a second member formed with an opening smaller than the larger portion of the stepped opening and partially closing said larger portion of said stepped opening. A resilient packing positioned between the keys and a multi-input terminal is formed with projections for returning each key to its original position and for actuating the associated terminal. Said first member may be the cover glass of an electronic wristwatch with a calculator therein, while said second member may be a display plate for identifying the function of said keys.

Abstract: A fuel system is provided with two filters between the L.P. pump and the H.P. pump, both of which are used (in parallel) when the temperature of the L.P. fuel is above 0.degree. C. When the temperature of the fuel drops below 0.degree. C., all the L.P. fuel is passed through the first filter, and a small supply of warm H.P. fuel is passed through the second filter. Ice collects in the first filter until a predetermined pressure drop across it causes all the L.P. fuel flow to be switched to the second filter. The first filter is then de-iced by a small supply of warm H.P. fuel. This cycle is repeated continuously while the temperature of the L.P. fuel is below 0.degree. C.

Abstract: A signal representative of liquid fuel flow or gaseous fuel pressure is compared to a limit value throughout the startup and load operation of a combustion turbine. Under predetermined fuel supply conditions the turbine is either alarmed or tripped. The fuel limit value is a function of combustor shell pressure and altitude.

Abstract: An axial flow gas turbine engine has a combustion section with a number of nozzle assemblies for injecting fluent materials, such as fuel, combustion enhancers, or pollutant reducers, into a burner which is supplied with air from the combustion section plenum. The nozzle assemblies are carried by a wall separating the plenum from the outside of the engine and extend from the wall to associated openings in the burner can. The nozzle head and an associated feeder tube is easily removable from the remainder of each nozzle assembly for cleaning, repair or replacement of the nozzle head, or for other purposes. The nozzle assemblies and their supply manifolds are further arranged so that a central liner of the burner can may be removed through the wall without disturbing the nozzle assemblies or the supply manifolds.

Abstract: A new and improved low emission combustor comprises a plurality of concentric cylindrical shells spaced radially to provide air supply and cooling passages and a primary fuel supply means disposed at the inlet end and a secondary fuel supply means disposed at the outlet end and arranged so that fuel supplied by the primary fuel supply means is less than that required for full load operation and the remainder of the fuel required to full load being supplied as needed by the secondary fuel supply means. Regeneratively heated combustion and cooling air is provided at the inlet and exit ends of the combustion chamber and at various intermediate locations along the length thereof to effect staged combustion and flame cooling.

Abstract: A connector for interengaging the exhaust header components of an internal combustion engine that are subjected to movement and vibration to a turbine compressor and/or tail pipe components that are constrained and relatively unmoving wherein inner and outer sleeves of generally telescoping type are separately joined to said moving and constrained components by angular misalignment compensating ball socket joints held in assembled relation with said components by mating flanges. Said inner and outer sleeves further cooperatively provide a close interfitting engagement between a smooth cylindrical surface on one sleeve and a plurality of spaced circumferential ribs on the other sleeve to provide spaced apart pressure sealing zones whereby the pressure of any escaping exhaust gases are reduced by stepped gradients.

Abstract: A turbine power plant of particularly inexpensive construction and using static expansion of the combustion gas to accelerate slugs of liquid used as the motive power for a Pelton wheel. The turbine power plant comprises a fuel combustion unit producing combustion gas which serves to impart speed to slugs of an auxiliary liquid, like water, in output pipes; this auxiliary liquid acts on a Pelton wheel to produce rotary drive. A part of the auxiliary liquid is reconverted as slugs to compress the air supplied to the fuel combustion unit. The turbine power plant also includes a second Pelton wheel driving a common shaft for an air fan, and a pair of rotating nozzles arranged to produce the said slugs of auxiliary liquid. The second Pelton wheel is driven by part of the auxiliary liquid.

Abstract: A rotating fluid coupling of the type which has a primary coupling half and a secondary coupling half which together form a working chamber which is filled with working fluid. A control device which is arranged on the secondary coupling half is used to regulate the rotary take-off drive speed of the coupling by comparing an operating value, such as the centrifugal force which is a result of the rotating drive speed, with a variable command value and when the operating value differs from the command value initiates adjustment of the rotary drive speed. A fluid container on the secondary coupling half revolves with the secondary coupling half. A stationary supply line for control fluid to the fluid container is provided with a permanent outlet opening at a distance from the axis of rotation of the fluid coupling.

Abstract: A system for selectively and controllably supplying pressurized fluids to dental or surgical tools requiring high pressure air at two levels of pressure and low pressure air and/or liquid.

Abstract: A hydraulic control system comprising a hydraulic actuator having opposed openings adapted to alternately function as inlets and outlets for moving the element of the actuator in opposite directions and a variable displacement pump with loading sensing control for supplying fluid to said actuator. A meter-in valve is provided to which the fluid from the pump is supplied and a pilot controller alternately supplies fluid at pilot pressure to the meter-in valve for controlling the direction and displacement of movement of the meter-in valve and the direction and velocity of the actuator. A pair of lines extends from the meter-in valve to the respective openings of the actuator and a meter-out valve is associated with each line of the actuator for controlling the flow out of the actuator when that line to the actuator does not have pressure fluid from the pump applied thereto. Each meter-out valve is pilot operated by the pilot pressure from the controller.

Abstract: A telescoping hydraulic cylinder apparatus for elevator application, wherein telescoping cylinders and a piston rod extend or retract simultaneously, having a compensator pump for automatically replenishing fluid lost due to leakage from the upper cylinders of the apparatus.

Abstract: A tandem master cylinder for a vehicle split hydraulic braking system which has disc brakes in one part of the system and drum brakes in the other half. One of the pistons in the master cylinder is prevented from developing a substantial pressure until a predetermined pressure is developed by the other piston by virtue of a control piston working in a blind bore in one of the pistons. Hydraulic fluid is trapped in a control chamber formed by the blind bore and the control piston by a first valve means and released by a second valve means at the predetermined pressure. The arrangement allows pressure to the disc brakes to be delayed while pressure to the drum brakes is overcoming the effects of the usual pull-off springs.

Abstract: A tandem master cylinder for a vehicle split hydraulic braking system which has disc brakes in one half of the system and drum brakes in the other. One of the pistons in the master cylinder is prevented from developing a substantial pressure until a predetermined pressure has been developed by the other piston by virtue of a quantity of fluid trapped in a control chamber by a control piston. First and second valve means control the pressure in the control chamber. The valve means include a plunger which initially moves against a first control spring to allow a valve member to seat and trap the fluid in the control chamber and subsequently moves away from the valve member under an increased pressure in the control chamber against a second control spring to release the trapped fluid.

Abstract: A brake bleeder adapter, for use with automotive brake system master cylinders having reservoirs which should not be subjected to clamping and/or bleeding pressures as was done according to prior methods of brake bleeding, connects the hydraulic brake system of the automobile to a supply of pressurized brake fluid without subjecting the reservoir to such pressures during the process of bleeding the brakes. When securing this adapter to the brake system, the master cylinder fluid reservoir is essentially by-passed and the adapter is connected directly to the master cylinder. Entrained air within the replacement brake fluid is effectively prevented from entering the brake system by either releasing such air from the fluid or confining it to the fluid remaining in the adapter thus reducing the time needed to complete the bleeding process.

Abstract: An air/hydraulic actuator for a vehicle braking system uses a surface on a push rod to easily and quickly position the push rod with respect to a piston slidable in the base of a hydraulic master cylinder so that with no air pressure the air actuator push rod is just clear of the piston to ensure complete return of this piston.

Abstract: A method and apparatus for generating steam including an internal combustion engine providing mechanical energy and also thermal energy which is commonly referred to as waste heat. In one aspect, the engine drives a heat pump, and the low temperature side of the heat pump removes waste heat from the engine and in some instances also heat from the environment, while the high temperature side of the heat pump delivers heat to an unfired steam boiler. In another aspect, the engine drives a water injectable compressor, and waste heat from the engine is utilized in a heat exchanger to boil water and thereby produce steam at a relatively low temperature and pressure. This steam enters the compressor and emerges therefrom at a relatively high temperature and pressure. In all aspects, the generated steam can be used for such applications as heating or the operation of a steam engine.

Abstract: An arrangement of constructual elements used for the conversion of fluctuating natural energy and generation of constant rotary speed of a power-producing machine or motor, electric or otherwise, by way of free-falling masses in the place of commonly used regulators or governors. With this arrangement, the invention realizes a transmission for which, in contrast to known transmissions, the output speed is constant regardless of the input speed so long as the input torque is equal to or greater than the output torque.

Abstract: A method for generating electricity wherein a geothermal fluid is produced from a moderate temperature hydrothermal formation and is used to supply sufficient sensible heat to preheat a working fluid, thereby cooling the geothermal fluid. The cool geothermal fluid is preferably reinjected into the hydrothermal formation and the preheated working fluid is injected into a dry hot rock formation wherein it is vaporized. The hot vapor is then recovered and utilized in a heat engine/generator for the production of electricity.

Abstract: An automatic chilled water setpoint temperature control for use with a mechanical refrigeration machine. The control includes means to sense the magnitude of a first electric control signal which is produced by the machine and which is a function of the amount of work done by the compressor of the machine. The control also includes means to change the magnitude of a second electric control signal, which is also produced by the machine and which represents a variable component of the setpoint temperature, in response to a change in the magnitude of the first electric control signal so that the variable component of the setpoint temperature changes in response to a change in the amount of work done by the compressor. The control further includes means to delay changing the magnitude of the second electric control signal so that the amount of work done by the compressor becomes stable before the variable component of the setpoint temperature changes.