Abstract: An extruder for converting pressurized liquid CO.sub.2 feed into dry ice pellets of predetermined shape and size, wherein the CO.sub.2 snow formation, CO.sub.2 snow compaction, and dry ice pellet extrusion phases occur simultaneously to achieve production rates on the order of 700-1000 lbs/hr. The compacted CO.sub.2 snow may be in the form of a solid cartridge or irregularly shaped solids, and such compacted particles may constitute an end product by themselves. The increased production rates are also achieved by enhanced removal of CO.sub.2 gas from the CO.sub.2 snow formation chamber, and use of a bidirectional internal regeneration cylinder to provide compactive force. The extruder is portable, since it only weighs approximately 1000 lbs., can be powered with a non-stationary energy source, and may be used to remanufacture partially sublimated dry ice solids into extruded dry ice pellets of a predetermined shape and size.

Abstract: An aerospace vehicle fuel pressure, or cryogen tank apparatus includes a tank load bearing wall of composite laminate construction that is lined with a film laminate liner that includes at least two metalized layers bonded with adhesive with the metalized coatings facing each other. The liner is bonded to the load bearing wall with an adhesive. The improved tank apparatus is able to withstand extreme pressure and extreme temperature conditions, and while containing cryogens such as liquid helium and liquid hydrogen.

Abstract: A device for recycling a cryogenic liquid in a circuit (1) comprising at least one section (2) substantially at ambient pressure, the device comprising: a) a first cryogenic reservoir (4) to recover the liquid at the outlet of the section, this reservoir being provided with structure (4.sub.3, 6.sub.1, 7.sub.1, 8.sub.1) to pressurize the recovered liquid, b) a second cryogenic reservoir (5) continuously pressurized in operation and connected to the circuit (1) upstream of the section (2) open to the air to supply it with pressurized cryogenic liquid, the second reservoir being in selective fluid communication (16) with the first reservoir, and c) a device (12) responsive to a predetermined relationship of the levels of filling of the two reservoirs selectively to actuate the pressurization structure (4.sub.3, 6.sub.1, 7.sub.1, 8.sub.1) of the first reservoir (4) so as to transfer into the second reservoir (5) cryogenic liquid contained in the first reservoir.

Abstract: An air conditioner arrangement for a vehicle, especially a motor vehicle, having a condenser designed as a block of tubes and ribs with lateral collecting tubes on both sides. One of the collecting tubes forms a structural unit with a collector, which contains a dryer and has a cage-shaped sleeve in which dryer granulate is contained in a bag.

Abstract: Apparatus for maintaining a superconducting magnet which is refrigerated within a cryostat at or near its operating temperature in the event of the cryostatic refrigerator ceasing to operate comprising a heat sink within the cryostat and in thermal communication with the magnet and means automatically to transfer heat from the heat sink out of the cryostat.

Abstract: An element comprised of a cryoretentive material is adapted for insertion into and support within the inner vessel of a cryogenic dewar adjacent one or more sample holders. Such a cryoretentive element may be adapted for disposition within the canister of existing sample holders and for acceptance of one or more samples, thus permitting the convenient conversion of unprotected dewars for protection against upsets and for improved sample holding times. Such elements provide a convenient and inexpensive conversion of cryogenic dewars for shipping, an improved ability to maintain samples in a cold state for longer periods of time and an improved sample holder with protection against a loss of liquid cryogen.

Abstract: A method of assembling a closed loop refrigerating air conditioning system using a hydrofluorocarbon refrigerant by applying a first oil which is insoluble with the hydrocarbon refrigerant to components of a compressor, and storing the insoluble oil within the housing of the compressor in a single or mixed state.

Abstract: The rate of water vapor sorption of an absorption cycle cooling and/or heating system using an aqueous alkali metal hydroxide solution as the working fluid is increased by adding at least 2 parts per million of a primary, secondary or tertiary aliphatic, cycloaliphatic or aromatic amine to the fluid.

Abstract: A method of controlling the capacity of a chiller system, the chiller system including a circularly linked compressor, condenser, expansion device, and evaporator. The method comprises the steps of: measuring a first chiller system parameter; determining a first parameter error as a function of the difference between the first parameter and a first setpoint; measuring a second chiller system parameter; determining a second parameter error as a function of the difference between the second parameter and a second setpoint; providing a first mode of capacity control where the compressor is modulated in response to the first parameter error and the expansion valve is modulated in response to the second parameter error; and providing a second mode of capacity control where the compressor is maintained at a minimum capacity and the expansion valve is modulated in response to the first parameter error.

Abstract: Disclosed is a method for reducing the temperature of the air passing over the condenser surface of an air conditioner unit, thereby reducing the power requirements of the unit. The method is carried out by applying water to the condenser surface to achieve coverage of substantially the entire outside surface and the entire inside surface of the condenser with water while the unit is operating. The amount of water applied should be sufficient to wet substantially the entire inside and outside surface of the condenser. The water can be applied from a tubing having a plurality of passages opening through its sidewall at generally linearly spaced apart positions. An adjustable valve means can be positioned near the inlet end of the tubing to regulate water flow through the tubing. An electrically actuated on-off valve can be operatively connected to the tubing between the adjustable valve and the passages so that water will flow only when the compressor is operating.

Abstract: An electronic control mounting system for a refrigerator. In the refrigerator, a freezer compartment is defined by a freezer liner, a fresh food compartment is defined by a fresh food liner and a partition wall is disposed between the compartments. A mounting plate is disposed between the freezer liner and fresh food liner within the partition wall and includes a mounting boss and a conduit boss. The conduit boss joins a first opening provided in the freezer liner and a second opening provided in the fresh food liner such that a channel is formed between the fresh food compartment and the freezer compartment. A housing member, supporting a control printed circuit board (PC board), is secured to the bottom surface of the partition wall by attachment to the mounting boss provided on the mounting plate. The PC board further includes a first temperature sensor having a pair of extending electrical leads directly soldered or mounted onto the PC board.

Abstract: A heat pump type air conditioner for a vehicle has a compressor to which a condenser and a inner heat exchanger are connected through a first switching valve. The condenser is connected at its refrigerant outlet to the inner heat exchanger through a second switching valve. An refrigerant outlet of the inner heat exchanger is connected to an evaporator through an expansion valve. A refrigerant outlet of the evaporator is connected to the compressor. The first switching valve functions to change the operation or the air conditioner between heating and cooling. The first and second switching valves function to allow to flow the refrigerant into the outer heat exchanger even if in heating, according to the thermal condition of the outer heat exchanger. Therefore, it becomes possible to stably implement heating without causing a stagnation of the refrigerant in the outer condenser even under a cold thermal condition.

Abstract: The frozen dessert machine of the present invention provides an inner core in its refrigeration chamber.

Abstract: An ice making machine in which ice making water in a static or flowing condition is gradually frozen on the surface of an ice making plate cooled at an ice making cycle of the machine, wherein the surface of said ice making plate is made of synthetic resin or glass.

Abstract: An apparatus for packaging temperature sensitive materials for transportation are provided in which an insulating container is assembled from a corrugated fiberboard carton, a plastic liner bag and slab-like rigid foam insulating wall liners. The slab-like rigid foam insulating wall liners are of a size to snugly fit the inner walls of the carton and are positioned against the inner walls of the carton inside the plastic liner bag to create an insulated chamber. The insulated chamber is capable of holding two frozen bottle style refrigerant packs against its inner lined sidewall and two refrigerated brick style refrigerant packs against its top and bottom lined walls to create a cooling chamber within which temperature sensitive materials housed in a flexible foam insulation lined container are cooled by a heat transfer cooling mechanism which is capable of maintaining the temperature sensitive materials at a temperature in the range of 2.degree. C. to 10.degree. C. (36.degree. F. to 50.degree. F.

Abstract: In a banana ripening room, pallets of boxes of fruit are stacked in individual locations defined by a support structure, in two spaced apart rows separated by an aisle, and in two superimposed tires. The aisle defines a volume into which air is introduced under pressure by fans in an overhead space separated from the room by a false ceiling. All the gaps between adjacent pallets and structural members are sealed by rubber flaps, an efficient seal being obtained when boxes are used which are designed for use in pressurised ripening systems. The flaps are attached along one edge to structural members and free at their other edges to conform to the contours of the pallet loads, thereby ensuring that air can be cycled only through the pallet loads to lower pressure zones beyond the rows of pallets.

Abstract: A beverage container is provided for use with a golf cart or the like having a support member. The container includes a body having a central beverage receiving cavity which extends from the closed bottom of the body to the open top end of the body. The container also includes means for receiving a freezable gel, the means being disposed within the beverage receiving cavity. A cap is provided to be releasably attached to the open top end of the body. The container further includes means for attaching the body to the support member.

Abstract: Compressor lubricant in a screw compressor-based refrigeration system is cooled by directing the lubricant from the system oil separator to an oil-cooling heat exchanger disposed in the lower portion of the system condenser where it is bathed in condensed system refrigerant. Parasitic capacity losses with respect to the compressor lubricant cooling process are thereby avoided.

Abstract: A regenerative sorption compressor assembly for use in a sorption compressor/refrigerator system. The regenerative sorption compressor assembly of the present invention comprises a series of sorption compressor elements connected to a flowing loop of heat transport fluid. The compressor elements are heated and cooled by the heat transport fluid. At some point in the loop the fluid path is broken and the fluid is diverted to a heat source. At another point in the loop the fluid path is broken and the fluid is diverted to a heat sink. The points at which the heating and cooling flows are diverted are switched from compressor element to element in the direction of fluid flow at such a rate that the thermal capacity rate of the fluid in the heat transport loop relative to the moving switch point is equal and opposite to the thermal capacity rate of the compressor assembly relative to the switch point.

Abstract: An accumulator for use in an air-conditioning system wherein a refrigerant fluid is circulated. The accumulator embodies an enclosed housing defining an internal vapor chamber, an inlet tube, an outlet tube having a vapor inlet end in an upper portion of the vapor chamber, and a baffle member located within the housing between the upper and lower portions and within the vapor chamber to impede the flow of incoming partially vaporized fluid causing it to circulate within the chamber and allowing the refrigerant vapor to rise to the upper portion of the vapor chamber and to flow through the outlet tube. The baffle member is an integral part of the housing, being formed at the open end of one of two cup-shaped housing members and turning inwardly to provide a generally ring-shaped baffle member, with the cup-shaped members being joined at their open ends to complete the enclosed housing.

Abstract: A wrap ring assembly comprising a pair of wrap rings for accommodating an engagement or other ring therebetween is provided. The wrap ring assembly includes a first ring having a first band and a second ring having a second band spaced from and substantially parallel to the first ring. The rings of the assembly are interconnected by a pivot assembly which enables the bands to revolve about a common axis that is tangent to the periphery of each of the bands.

Abstract: An article of jewelry having a stone mounted on a support. The stone having two grooves formed in opposite side facets which are engaged by two facing surfaces of the support to secure the stone in the support. In one embodiment, the support includes an array of bars, each bar having a central cavity and two side walls. Each side wall has a surface for engaging a corresponding groove in the stone and an attachment for articulated connection of each bar to the adjacent bars.

Abstract: A decorative garment link for lingerie, swimsuits or the like is formed by anchoring a row of ornamental stones between two lateral walls of an elongated base from which a pair of strap-receiving loops project laterally. The lateral walls are pressed against the stones to hold them in place and are fused together or to respective end walls at the ends of the row of stones.

Abstract: Described is a fabric produced from textile threads, more particularly a knitted fabric, for use within the flexion area of articulated bandages. The knitted fabric is incorporated into the articulated bandage (2) in the form of an insert (8). In order to eliminate the formation of creases within the flexion area of the articular bandage, a transverse wave structure is formed on at least one side, which, by the use of an elastic thread arrangement which is incorporated or located underneath a top structure, is elastically pretensioned and stabilized and is connected to the top structure at predetermined intervals or according to a specific rule.

Abstract: The device comprises, for each selector element, a high-speed electromagnet having a fixed core with a single coil, and an armature consisting of a lightweight blade. When the coil is energized, the blade is moved into one position, and is restored to another position by means of a compression spring when the coil is de-energized, with a response time of less than 4 ms. The electromagnets are housed in the support of a selection assembly, and packed in at least two offset rows. Each coil is energized at a first voltage and is subsequently maintained energized at a lower voltage.

Abstract: A method of and an apparatus for controlling a washer capable of reducing errors of information required to control the washer to precisely control the washer and preventing a malfunction of the washer to improve a reliance of the washer, by analyzing various and complex data, deriving a correlation coefficient of the data according to the result of the analysis, and determining information required to control the washer, based on the correlation coefficient. The control apparatus includes a sensing unit having sensors for outputting data about various operation conditions of the washer such as a water level, a clothes quality and the kind of a detergent, a clothes amount, and a polluted degree of a washing water. A correlation coefficient operating unit is connected to the sensing unit. The correlation coefficient operating unit serves to analyze the data outputted from the sensors so as to operate correlation coefficients of the data.

Abstract: A clothes washing machine or combined clothes washing and drying machine, of the household type, is provided with a plastic tub (1) accommodating a spin drum (2) in which the clothes to be washed are loaded. The tub has a cylindrical mantle or outer wall (3) which is integral with a rear wall (4). A front wall (5) is molded separately and attached to the tub. A plurality of counterweights (6,7) contained in plastic shells (8,9) are attached to the tub, wherein the shells (8,9) are provided with an appropriate plastic projection (10,11) which fits together or mates with a corresponding plastic projection (12,13) located on an outer structure of the tub. The plastic projections (10,12 and 11,13) are fastened together through fusion-welding in order to firmly attach the counterweights to the tub.

Abstract: An electrical panel locking apparatus includes first and second elongated angle iron bars having panel gripping hooks on one end of each elongated bar. One of the elongated bars has a flanged end portion with an angled slot therethrough for sliding the other elongated bar so that one telescopes inside the other and each angle iron elongated bar has a plurality of openings therein so that openings in one bar can be aligned with the openings in another bar for inserting the shackle of a padlock to lock the bars together. Thus, the hooks on each bar connect to either side of the front panel of an electric box and each has an off-set angle to allow the locking bars to fit over the panel door. The elongated bars can be telescoped to clip around the edges of any size panel and over the panel door and locked in position.

Abstract: A device for securing hanging garments that is affixed to a garment rail. The securing device has a lock box with a cable. The cable has a proximal end fastened to the lock box and a distal end that is fed through a clamp and the hanging garment to be secured. The distal cable end is then locked by a locking device in the lock box. A key is used to unlock the distal cable end when the garment is to be removed and unsecured from the garment rail. The clamp has a lever that tightens and loosens the securing device to the garment rail while secured by the cable. The securing device may be adjusted along the garment rail according to the proprietor's requirements. Such as, the securing devices may be spaced accordingly along the length of the garment rail for usage or slid to one end of the rail for segregated usage, if desired. The lock box has seals to prevent the flow of lubricants and dirt from the locking device to the distal end of the cable to prevent the cable from soiling the secured hanging garment.

Abstract: A door grip assembly comprises a grip having a vertical sleeve-like member elastically fitted in bearing grooves of a grip casing and also having increased diameter portions engaged with walls of the grip casing, an angular drive bar inserted through angular through bores of the vertical sleeve-like member, a latch support having a base fitted in opposed L-shaped pawls in one of pawl pairs each provided on each end of top and bottom portions of a base plate member having a front central portion thereof engaged with an intervening portion between the opposed L-shaped pawls, the base plate also having an integral tongue portion having an end projection elastically fitted in a hole formed in the intervening portion, and a vertical round bar having an upper jaw and a lower jaw engaged with wall portions of the latch support, and a vertical round bar provided with an upper and a lower angular hole defined by a partitioning wall, opposite ends of the angular drive bar being fitted in the angular holes.

Abstract: A hierarchical lock and key system includes a plurality of locks and keys wherein each key is provided with at least one unique bitting surface that engages a complementarily shaped tumbler pin tip to cause the tumbler pin to rotate and be positioned at a predetermined location. In one system, one key is provided with bittings to rotate the tumbler pins in a lock that is able to determine the rotational position of the tumbler pins. The one key may also operate a lock which does not determine the rotational position of the tumbler pins by positioning a tumbler pin at its proper elevation in the cylinder. Another key which has at least one different bitting from the one key will operate the latter lock (in which the tumblers do not have to be rotated). However, the other key will not operate the former lock because the bitting does not, properly rotate the tumbler pin to its unlocking location.

Abstract: Method and apparatus applicable to a press using a die set including a lower and an upper die which are removably installed movably towards and away from each other to perform a pressing operation under the adjusted operating conditions. A memory is provided to store machine information relating to the press and necessary to determine optimum values for the operating conditions. Die set information relating to the die set and necessary to determine the optimum values are received through a data input device. A calculating device calculates the optimum values, based on the machine information and the die set information, and an adjusting device automatically adjusts the operating conditions according to the calculated optimum values.

Abstract: A gas management system for delivering forming gas under a controlled pressure through a first portion of a piping network to a region of a forming die between a die lid and a blank to be formed in a superplastic forming machine includes a gas pressure regulator in the piping network and two control loops. The first control loop has a first pressure transducer communicating with the piping network downstream of the gas pressure regulator and operatively with the gas pressure regulator. The second control loop includes a pulse controller downstream of the first pressure transducer and a second pressure transducer communicating with the piping network downstream of the pulse controller and operatively with the pulse controller. The gas pressure regulator receives signals from a controller to adjust the pressure at which the gas pressure regulator opens to release gas through the pressure regulator.

Abstract: A method and apparatus are provided for isostatically bulge forming tube stock. The tube is assembled in sealing arrangement with a split die. The assembly is placed in a pressure vessel wherein an non-compressible fluid is pressurized to form the tube into the die cavities. Because the force on the tooling is compressive in nature, relatively low strength, low cost tools may be used.

Abstract: A method and apparatus for hot-rolling a slab of steel in which a cast slab is heated in a tunnel furnace to a hot-rolling temperature, rolled to a lesser thickness in a tandem mill, reheated in the same tunnel furnace and then rerolled in the same tandem mill to a final thickness.

Abstract: A forward feed gear mechanism for a cold pilger rolling mill having at least one forward feed slide, whose advancing movement can be derived from at least one forward feed spindle which is driven in continuous rotation, and an oscillating axial movement can be superimposed on the rotational movement of the forward feed spindle so that the gear mechanism is flexible and adaptable to different settings and provides high acceleration values with a simplified gear unit design. A planetary rolling spindle is provided for generating the axial movement of the forward feed spindles and is coaxially connected with one end of the forward feed spindle so as to be independently rotatable. The housing of the rolling spindle is rigidly arranged in the forward feed gear mechanism housing and the planetary rolling spindle can be driven in rotation in a translatory manner by a separate drive via a spur gear unit stage.

Abstract: A manifold for a heat exchanger is formed by placing a blank having a siamesed pair of tubular passages supported by a first mandrel into a die cavity which receives the blank and defines at least one riser channel extending from the cavity. Each riser channel includes a core such that when a punch forces the blank into the die cavity, the blank is formed as desired and a portion of the blank is forged into the riser channel and around the core. The portion of the sidewall of the blank adjacent to the tubular risers is thickened such that the sidewall of the resulting manifold is substantially uniform after forging. After forging, the blank is removed from the die and the first mandrel is removed. The manifold is completed by inserting a second mandrel including holes in substantial alignment with the tubular risers and forcing punches into the tubular risers to remove the remaining material which separates the risers from the passages.

Abstract: The invention provides a method of, and apparatus for detecting and analyzing moving particles using an impact responsive transducer which generates a detection signal having an amplitude related to force of particle impact. The transducer output signal is monitored and when it exceeds a given threshold, any local maximum values are noted. Those values are compared to determine which has the overall maximum amplitude. A final signal is then generated in order to provide a representation of the maximum value, and hence the momentum and time occurrence of a particle impact.

Abstract: A method for determining the amount of a contaminant in a refrigerant gas under pressure and the detector tube and tube holding assembly. The method involves preparing a predetermined length of refrigerant hose and connecting a pressure gauge to an exit end of the hose. The entrance to the hose is connected to a sealed detector tube which is held in a fitting which connects to conventional refrigerant hose. This fitting is connected at its other end to a source of refrigerant gas under pressure to be tested. The gas is allowed to pass through the detector tube into the known length of empty tube until the pressure gauge reaches a predetermined value depending upon the refrigerant gas to be tested. This causes a known volume of gas to pass through the detector tube and the detector tube changes color and the distance that the color change has taken place is a measure of the contaminant. Different detector tubes are used for different contaminants.

Abstract: An exhaust-gas analyzer, particularly for emissions testing of motor-vehicle engines has a sampling tube into which a mixture of exhaust gas and ambient air is fed through gas lines. A gas feed pump is disposed downstream of the sampling tube with a flowmeter inserted in the air line feeding electrical signals to a computing unit. The unit computes instantaneous standard total flow rate, allowing for gas pressure and temperature.

Abstract: According to the invention a hygrometer is provided for measuring the moisture content of a gas, the hygrometer comprising a chamber 2 housing a hygrometer sensor 1, a gas inlet 3 for admitting gas into the chamber and a gas outlet 4 for allowing gas to leave the chamber, the apparatus being such that a drying medium can be stored in the chamber to dry the sensor and then be rapidly removed from the chamber prior to measurement, for example via a removable lid 5.

Abstract: A knock sensor detects the vibration of an internal combustion engine and the half wave of its output of the sensor is amplified by a half wave amplifier. From the amplified output, a vibration-signal producing circuit produces a vibration signal representative of the vibration of engine in synchronism with the crank angle. An arithmetic operation unit produces a reference signal. Then a comparator compares the reference signal with the vibration signal to output a knock signal indicative of the occurrence of knocking of the engine when the vibration signal exceeds the reference signal. A gain adjusting circuit may be provided between the knock sensor and the half wave amplifier for adjusting the input level to the half wave amplifier to set the output level of the amplifier to a proper level. The half wave amplifier may be provided with a gain selecting circuit which automatically changes the gain of half wave amplifier in accordance with the level of the knock sensor output.

Abstract: A method and apparatus for detecting defects in a structure formed of a honeycomb matrix bonded to a support surface including providing a probe body including means defining a fluid passage forming a supply port to an exterior surface of the probe body; connecting a pressurized fluid source to the fluid passage at a location distal from the supply port; placing the supply port in close proximity to a cell of the honeycomb matrix; supplying fluid from the compressed fluid source to the cell via the fluid passage; and monitoring a fluid pressure produced at a portion of the honeycomb matrix adjacent to the supply port to detect disbonds between the honeycomb matrix and support surface.

Abstract: A pressure difference detector for detecting a pressure difference between atmospheric pressure and a fuel system vapor pressure to be measured, includes a pressure dampening member 17a for dampening the flow of atmospheric air between an introducing inlet 11a and a reference pressure chamber 12 to limit the air flow rate to a value smaller than a leakage flow rate between the chamber and a fuel system vapor pressure introducing inlet 11b due to a leaking 0 ring seal. This prevents an erroneous judgment that the fuel system is leaking.

Abstract: In accordance with illustrative embodiments of the present invention, the existing valves in a crude oil, gas, or other product pipeline are positively sealed off to allow a pressure test to be made of a section or segment of the pipeline between the valves. The section is packed with a hydrocarbon or aqueous liquid. A mixture of a highly viscous hydrocarbon based gel material and a lost-circulation material are injected into the pipeline segment adjacent each valve to form plugs in the line. The gel plugs are squeezed under pressure against the internal components of each valve to cause all leakage paths therein to be bridged over and sealed off. The pipeline segment then is pressure tested to determine if there are any leaks therein, after which the gel is flushed out of the line and broken down into a linear pumpable state for disposal.

Abstract: Hydrostatic pressure testing apparatus for sealing and delivering fluid into a pipe wherein the pipe wall is maintained in tension. A pair of cam actuated movable jaws are mounted on a body for engaging the outer wall of the pipe. A seal ring on a mandrel is positioned to expand into sealing engagement with the inner wall of the pipe. A shaped passage in segments of a split die block lock behind the upset portion on the end of the pipe.

Abstract: Method and apparatus for optimizing the extraction of aromatics from waxy distillates and the dewaxing of waxy raffinates in the manufacture of lubricating oils.

Abstract: The invention is directed to a method and an arrangement for checking the operability of an actuator for the air supply and especially in combination with an idle control. By a retard shift of the ignition time point, the operability of the actuator is determined when the engine speed remains essentially constant and the engine load increases.

Abstract: An air flow rate meter for detecting an air flow rate in a wide operating temperature range. A heating temperature of a heat generating resistor for detecting an intake air flow rate is set on the basis of an intake air temperature or a current flowing through the heat generating resistor. The heating temperature of the heat generating resistor is kept at an optimum value determined from a look up table stored in a read only memory.

Abstract: A system for the inspection of a well borehole and the formation around the borehole. The system includes a sealed tubing at the lower end of which is mounted a fiberoptic telemetry module which receives various sensor modules for transmissions of sensed information to the surface. The modular telemetry link and sensor include fluid passageways through which fluid pumped from the surface down the sealed tubing may pass to create a region of optically clear and/or acoustically homogenous fluid in the borehole in the vicinity of the modular telemetry link and sensor. The passage of fluid through the passageways in the modular equipment may also serve to cool the circuits thereof.