Abstract: Each support plate is provided at its top surface with substantially cylindrical raised portions or protuberances, between which there is present in each case an intermediate space. The raised portions are arranged in rows extending parallel to one another. The raised portions of one row are offset with respect to the raised portions of both neighboring rows. Each of the raised portions have extending therethrough a recess oriented transversely with respect to the rows. Each of the recesses is in alignment with the intermediate space formed between two raised portions of the neighboring rows. The entire top surface of the support plate is covered with a metallic heat conducting layer. In the intermediate spaces and the recesses it is possible to lay, with a random course of extent or travel, the heating pipes or conduits.

Abstract: An improved sulky and harness is disclosed. The improvement includes a pair of ball joints joining the shafts of the sulky to the harness of the horse. The ball joints avoid unnecessary restraint upon the running horse by allowing only pulling forces to be applied through the shafts to the sulky. The driver's seat is positioned up higher than the conventional sulky and forward of the wheel axles to reduce or eliminate the upward lift of the shafts during acceleration at the start of a race.

Abstract: A lawn mower blade clutch-brake mechanism having a driving drum and a driven blade carrier, the carrier having clutch shoes engageable with the inside of the drum and brake drum segments fixed to the shoes and disposed outside the drum for engagement by an encircling brake band which both applies braking drag and mechanically forces the segments inward to disengage the clutch shoes, and including the improvement that the clutch shoes are pivoted to the carrier at their leading ends in the direction of rotation so as to be aggressive and self-energizing, and the segments are pivoted on the same pivots and have trailing ends which are swung outward from a cylindrical position concentric with the axis of rotation when the clutch shoes are engaged so that the segments are first engaged by the brake band at and in the direction of their outward sloping trailing ends.

Abstract: A fluid comparator assembly which is clamped to the floor of a cotton harvesting unit and includes an arm for contacting the top of a spindle. The arm is operably connected to a fluidfilled cylinder communicating with a gauge. As the picker bar drum is rotated and a different spindle contacts the arm, any deviation in spindle height will be indicated by a change in fluid column height on the gauge. The cross-sectional area of the cylinder is much greater than that of the gauge column so a small deviation in spindle height results in a large, easily readable change in fluid column height. Each spindle bar is shimmed so that the maximum deviation as indicated by the change in column height is within the desired tolerance.

Abstract: A rotary lawn mower 2 includes a housing 4 having a side discharge port 54 located downstream of a rear discharge port 52. A downwardly opening tunnel 32 is tilted from front to back to define a grass circulating passageway. Discharge ports 52 and 54 may be blocked so that tunnel 32 operates as an improved mulcher with the grass clippings being discharged therefrom in a substantially downward direction. Lawn mower 2 includes a grass receiving means 12 having a chute 140 which may be releasably coupled on rear deck 21 of housing 4. Chute 140 has an open mouth with an area which is much larger than the cross-sectional area of the chute to more easily empty a bag 126 attached to the chute. In addition, dispersal attachment 180 can be alternatively coupled to rear deck 21 for dispersing the cut grass clippings in a pattern behind housing 4.

Abstract: In the combination of a textile yarn spinning machine, a traveling unit movable along the spinning machine for monitoring production of attenuated strands, and supply strand interruption mechanism responsive to the traveling unit, an improvement which comprises a wedge member movable relative to a back roll pair of a drafting unit between a normal running position withdrawn from a nip formed between the rolls and an interruption position of insertion into the nip, together with actuation mechanism mounted above and overlying the corresponding drafting unit.

Abstract: An apparatus for braking and positioning a spinning or twisting spindle with the spindle rotor in a specified position, having a spindle brake which engages with a rotary part, preferably a wharve, of the spindle, and, separate from said brake, positioning means comprising an additional braking surface which extends over part of the periphery of a rotary part, preferably a wharve, of said spindle and up to which an additional brake member is movable. The apparatus provides a more simply constructed braking and positioning means where it is permissible for the spindle to be stopped within a certain angular range about a prescribed central position. In the illustrated embodiment, a spindle brake proper comprises shoe means 7 engageable with an inside periphery of a skirt 5 of wharve 4, and there is provided positioning means comprising an additional braking surface 9 which preferably extends over an angle from 15.degree. to 30.degree. and which is engageable by an additional brake shoe 12.

Abstract: Heat generated in an atmospheric coal combustion process is recovered by air compressed in a hydraulic compressor and passed through air heaters in an associated coal combustor and through a heat exchanger means in thermal contact with the exhaust flow of a gas turbine to thereby provide a heated compressed motive fluid for the production of useful work in the turbine.

Abstract: A diffuser and baffle device prevents sea water intrusion or ingestion into marine gas turbine engine exhaust system without significantly increasing exhaust back pressure. Inboard and outboard rows of vertical turning vanes are separated by a gap and effect successive bends of the exhaust flow in opposite directions while affording an increase in cross-sectional area. The outboard vanes are slotted at their inboard edge portions, and the inboard vanes are provided with hook-shaped projections defining grooves, whereby water driven into the device is arrested and drained overboard.

Abstract: In an automotive gas turbine power plant including at least one power turbine rotor and a further turbine rotor driving the compressor of the plant, the latter rotor is undersized with respect to the power consumption by the compressor during normal operation and is augmented from the power turbine rotor. The turbine rotors are interconnected by a stepped planetary gearing to which the output shaft is also connected. An infinitely variable transmission is provided between the input to and the output from the gearing for continuously changing the gear ratio.

Abstract: Fuel flow to a gas turbine engine is controlled in response to power lever position and CDP. Fuel is supplied to the engine through three fuel flow regulating circuits which are in parallel. In one of these circuits there is a valve which establishes a minimum fuel flow which decreases with increasing power lever advance. In a second circuit there is a valve which modifies fuel flow in response to CDP. In a third circuit there is a valve which modifies fuel flow in response to CDP and receives fuel from a valve which opens with increasing power lever advance. The fuel control system includes a low power sensitive torque motor which may be activated to increase the pressure drop across the three circuits whose flow thus increases proportionally. Normal engine operation is obtainable without the use of the torque motor which provides an interface to an electronic control unit which senses various engine and ambient parameters and activates the torque motor in order to modify fuel flow accordingly.

Abstract: A propellant injector for a liquid rocket engine has an injection cylinder and moving piston in the cylinder. The cylinder on one side of the piston opens into the combustion chamber of the engine. The other side of the piston has a coaxial tubular portion projecting therefrom. A pair of valve members have concentric sleeves slidably mounted respectively on the inside and outside surfaces of the tubular portion of the piston. The outer ends of the concentric sleeves and tubular portion extend through an end wall of the injection cylinder. The valves open and close passages extending through the piston by relative axial movement of the sleeves and the piston. Pneumatic actuator means, connected to the outer ends of the sleeves and tubular portion, moves the sleeves axially relative to the piston to open the valves and move the piston toward the end wall of the injection cylinder to force propellant through the passages into the combustion chamber.

Abstract: A filter adapted to connect to an internal combustion engine in relatively close proximity to the engine. The filter will receive a stream of hot exhaust gas immediately as the latter passes from the engine's combustion chambers. The gas then passes through a filter bed disposed within a manifold system incorporated into the filter. The filter bed includes means for stabilizing the temperature thereof within a desired range, regardless of the operating condition of the engine, and the temperature of exhaust gas.

Abstract: The invention relates to a master cylinder for an automobile braking circuit which is suitable for dual-circuit or single-circuit application.The master cylinder has at least one chamber connected to the braking circuit, the pressure in the chamber being controlled by depression of a master piston by a brake pedal.

Abstract: An engine for operating a hydraulic motor. Opposed pistons, joined by a common connecting rod operating between two cylinders and between internal combustion valving and ignition components, are used to drive fluid under pressure through a series of cross-over valves to and from a hydraulic motor. Hydraulic fluid is stored and maintained under pressure within the engine cylinders on the other side of the pistons forming an internal combustion engine. A series of embediments within the common connecting rod actuate a matched set of proximity detectors. The proximity detectors, in turn, time the operation of the engines and the operation of the cross-over valves without mechanical linkages. A hydraulic pump is used to start the engine. A blower is used to mix the fuel and air within the engine and to exhaust combustion gasses. The hydraulic motor drives a flywheel to store energy and to dampen the pulsations resulting from the shifting of the cross-over valves and the reciprocating action of the pistons.

Abstract: A solar engine is disclosed in which a fluid, which is first heated and then cooled, forces a piston outward as the fluid is heated, and then draws the piston inward as the fluid is cooled. The piston is connected to a shaft and produces work as it moves outward and inward. A displacer plate moves between an absorber plate and a cooling plate to form an air space between the displacer and one or the other of these two plates for heating and cooling the fluid. The displacer plate is moved from one plate to the other by the displacer push ring as the piston nears the midpoint of its travel on the outward stroke and again on the inward stroke.

Abstract: An indirect gas turbine power plant is provided which includes primary and secondary combustors wherein fuel is burned and heat is conveyed to a turbine working medium which is subsequently passed through the turbine section of a gas turbine. The gas turbine includes both a compressor section and a turbine section. The primary combustor has a first inlet for receiving exhaust air from the turbine section, a second inlet for receiving fuel and an outlet for the discharge of products of combustion. The secondary combustor includes a first inlet for receiving at least a portion of the products of combustion from the primary combustor, a second inlet for receiving a portion of the products of combustion of the secondary combustor, and an outlet for the discharge of the products of combustion of the secondary combustor. An air heat exchanger for conveying heat from the products of combustion to the compressed air is positioned within the secondary combustor.

Abstract: A compact thermoelectric refrigerator includes a storage compartment, the lower portion of which is lined with a thin, high-conductivity aluminum liner which functions as an internal heat exchanger. The storage compartment is separated by means of a dividing wall from a compartment containing a thermoelectric module, a low profile, high density external heat exchanger including an extruded high thermal conductivity aluminum base and a plurality of closely spaced high thermal conductivity fins attached to the base by means of thermal epoxy, and a centrifugal fan disposed above the external heat exchanger and driven by a fan motor disposed in a recess in a wall of the thermoelectric refrigerator. Outside air is drawn by the centrifugal fan through an air intake grill located in the upper portion of an end panel and is forced through the fins of the external heat exchanger and out of an air outlet grill located along the lower edge of the end panel.

Abstract: A method of cooling a block of porous material comprising inserting said block into a chamber, subjecting the chamber to air pressure less than that of the ambient air and inserting means into the said block to induce a flow of cooling air through the interior of the block to the said chamber, whereby the lower pressure in the chamber causes the cooling air to flow inwardly through the means inserted in the block for cooling the block.

Abstract: A refrigerated display cabinet having air outlet ports in the top wall thereof for expelling ambient defrost air to the outside of the cabinet so that the air will not reenter the product display space. A baffle plate provided for blocking the passage of ambient defrost air into the top portion of the refrigerated air conduit during the defrost cycle from which it could flow into the product display space. A protective ambient air band is established across the access opening during the defrost cycle during which the flow of ambient defrost air is prevented from entering the internal cabinet product display space. The gate covering the air outlet port is used to mechanically control the closure of the baffle plate blocking the flow of ambient defrost air into the internal product display space.

Abstract: A temperature control circuit of an automobile air-conditioning system includes a temperature sensor for detecting the temperature of air blown into the room of the automobile. The signal detected by the sensor is compared at a first comparator with a voltage level corresponding to a predetermined temperature. The output of the first comparator at a time when the blown air temperature is lowered to the predetermined temperature, is delayed by a delay circuit and is applied to a second comparator. Then, the second comparator generates a signal for stopping the operation of the refrigerant compressor. The signal is also applied to a third comparator which maintain the stop signal until the signal corresponding to a higher temperature is applied thereto from the temperature sensor. Thus, the frost on the refrigerant evaporator can be defrosted before the compressor restarts.A fourth comparator is used for controlling the temperature of the room of the automobile.

Abstract: A variable fluidic time delay system for operating a plurality of pressure sensitive control switches to effect sequential operations at different pressure settings or for different components in response to the fluid pressure at a predetermined location in a refrigeration system, the time delay system including a fluid flow restrictor and unidirectional flow control in parallel by-pass relation with each other and connecting the control switches to the predetermined location of the refrigeration system for restricting pressurized fluid flow with a concomitant time delay in one direction and providing unrestricted fluid pressure equalization in the other direction, respectively.

Abstract: The heat pump/engine operates in an open cycle between a cold air reservoir and a hot air reservoir to pump heat or to obtain energy by exchanging air at atmospheric pressure between the two reservoirs at different temperatures.The heat pump/engine employs a positive displacement compressor, heat exchanger and a positive displacement expander to transfer the air flows. A means is also provided for adjusting the stroke volume of the expander during expansion in the heat pump version. Also, a snowmaker preheater can be used with the heat pump to decrease power consumption.

Abstract: An improved frozen dessert maker of the type having a motor with an output shaft mounted within a base, a can for containing dessert mix to be frozen, a dasher mounted within the can, and a top for sealing the can and supporting the dasher includes a plurality of coolant packs containing a coolant positioned concentrically about the can and secured to the can by means of a strap having a draw pull catch and strike, and a drive train wherein a second shaft parallel to the output shaft orbits about the output shaft. A lower stud which extends upwardly from the base acts as a bearing surface for an upper stud which extends downwardly from a platform supporting the can and coolant packs so that rotation of the output shaft of the motor causes the upper stud to move reciprocally against the lower stud causing the can and packs to move in a somewhat circular path about the axis of the second shaft with a reciprocating rotational motion superimposed on the circular path.

Abstract: Apparatus and method for thawing frozen food for use in a refrigerator appliance with a storage compartment maintained at a temperature between 33.degree.-55.degree. F. There is provided a container for receiving a frozen food load to be thawed within the compartment. An electric fan is in air flow communication with the interior of the container and timer means are provided for energizing and then deenergizing the fan after a predetermined period of operating time whereby the frozen food load may be thawed and allowed to remain in the container subsequent to thawing, the temperature within said container being substantially at the temperature of the storage compartment thus preventing spoilage of the thawed food.

Abstract: In a Rankine-cycle-engine-driven cooling-and-heating system comprising a power generating cycle including at least an expander, an oil separator, a condenser and a generator and a cooling-and-heating cycle including at least a compressor, an oil separator, a condenser, an expansion means and an evaporator, the housings of the expander and the compressor are so securely joined that a hermetically sealed space may be defined between them. This space is used as an oil separator which is common to both the cycles and is communicated with the outlet port of the expander and the discharge port of the compressor. As a result, the system can be made considerably compact in size as compared with the prior art systems in which the oil separator is disposed outside of the expander and the compressor.

Abstract: A multipartite protective device for universal joint shafts is formed with inner and outer telescoping protective tubes concentrically arranged with a plurality of elastic braking tongues being frictionally interposed between the tubes to prevent relative rotative motion therebetween, the elastic braking tongues extending in an arcuate configuration curved in the circumferential direction of the tubes with the braking tongues being arranged in pairs, the braking tongues of each pair being curved in opposed circumferential directions.

Abstract: A decorative surface for the exposed welt of a footlet-type sock is formed by knitting a plurality of successive courses of an elastic yarn and a synthetic or natural yarn in plated relationship. Each of the courses includes stitches formed and cast off in selected wales thereof separated by at least two successive float stitches, whereby the combination of the elastic yarn and the aforementioned knitting technique cause relatively wide bands or walewise ribs of raised or high relief fabric separated by relatively narrow bands of base fabric which exhibits a low relief area.

Abstract: A portable door lock (10) which is releasably coupled to door frame (12) and a door member (14) for positionally constraining the door member (14) to the door frame (12) when the portable door lock (10) is in an operational mode. The portable door lock (10) includes a door engagement mechanism (16) which is insertable between the door member (14) and the door frame (12) at the interface thereof. The door engagement mechanism (16) matingly engages the door member (14) on front and rear surfaces (20 and 22) and contacts the door frame (12) on a rear surface (24). A locking bar mechanism (62) is longitudinally displaceable on the door engagement mechanism (16) and extends across the interface (18) of the door member (14) and the door frame (12) for contacting the frontal surfaces (20 and 64) of the door frame (12) and the door member (14).

Abstract: A locking assembly for electrical enclosures to prevent unauthorized tampering with internal power connections. The locking assembly comprises an adjustable bracket which is secured to the walls of the enclosure by bolts; a cover which covers the open front and a substantial part of the sides of the enclosure and which is secured by a bolt to the adjustable bracket, a locking shield which overlies and prevents removal of the bolt which attaches the cover to the adjustable bracket, and a removable lock bolt which secures the shield to the cover.

Abstract: A plate tumbler for a cylinder lock mechanism, such mechanism including a tubular barrel provided with an internal longitudinal groove, and a key plug assembly rotatable in the barrel, such assembly including a key plug, a plurality of plate tumblers transversely reciprocally movable in slots in the plug and each having an end received in the barrel groove in a locking disposition of the mechanism, and spring means biasing such tumbler ends into the groove, such tumbler being relieved along the side edges of a body portion thereof, as compared to conventional tumblers, at diagonally opposite corners of the body portion, to provide a trailing edge having an arcuate end portion received in the barrel groove in the locking disposition of the mechanism and an adjacent oblique portion at one of the corners, and a leading edge having an oblique end portion at the diagonally opposite corner, whereby the arcuate end portion of the trailing edge hooks over the key plug while the oblique end portion of the leading edge

Abstract: A multiple-mandrel ring rolling machine for producing a ring from a ring blank having a plurality of elongated mandrel rolls rotatably mounted on a rolling platform fixedly mounted to a frame for rotation relative thereto is disclosed. The mandrel rolls are axially displaceable relative to the rolling platform between a first position above the rolling platform for rolling a ring blank and a second position below the rolling platform.

Abstract: An apparatus for flattening the weld bead of longitudinally welded tubes consisting of a hammering mass impacting with a frequency greater than 2500 impacts per minute and an anvil having an elastomer bushing at each end.

Abstract: A press operated by the reverse method comprising a fixed tubular die casing defining a pressing axis, a main jack operative to displace a cross beam supported for displacement along the pressing axis, a displaceable holder disposed between the cross beam and the tubular die casing and having a bore disposed along the pressing axis for receiving a billet to be pressed. The bore has open ends and the holder is capable of fitting over the die casing by axial displacement thereof. A closure member is carried by a slide for closing one end of the bore in the holder; the slide is displaceable on the cross beam transversely with respect to the pressing axis. A support is slidably mounted parallel to the slide and is carried by an auxiliary cross beam which is slidably mounted on the main cross beam for movement parallel to the pressing axis. The support and the slide are simultaneously displaceable under the action of a jack or other suitable device.

Abstract: A nonslip multi-pass wire mill with actuation of blocks by adjustable torque converters, having a coolant-lubricant supply system wherein a pressure line of a pumping station communicates with die holders and through the adjustable torque converters with a bath; the pressure line is connected to a low-pressure zone of a working chamber of each torque converter, a high-pressure zone of the working chamber communicates with the bath at approximately a mid-height thereof. The bath is connected at a lower level thereof to a coolant-lubricant tank using a pipe. The torque converter operates with the coolant-lubricant as a working fluid.

Abstract: An apparatus for reverse redrawing of a cup is provided with an annular ring surrounding the upper end periphery of body portion of a die ring, provided concentrically with the die ring, a slightly larger clearance than the wall thickness of the cup to be redrawn being provided between the inside surface of the annular ring and the outside surface of the die ring.

Abstract: A stock lifter for progressive dies in the form of a fixedly mounted fluid cylinder designed to be charged with gas at a desired pressure. A piston within the cylinder has a piston rod projecting upwardly from within the cylinder so that its upper end is adapted to lift the stock when the downward pressure on the stock is relieved so that the piston is at all times biased upwardly. The cross sectional area of the lower side of the piston is substantially greater than the upper side of the piston and the portions of the cylinder above and below the piston are in free communication.

Abstract: An apparatus for detecting the quantity of moisture in a given region includes a crystal of sodium chloride, a support for the crystal in the region and means for detecting the change in the electrical resistance of the crystal caused by the exposure of the crystal to moisture. A dry gas is caused to flow intermittently over the crystal to remove the accumulated moisture from it. This prevents the crystal from dissolving and allows the use of a smaller crystal than would otherwise be possible.

Abstract: An apparatus is provided for testing of bonded laminates which include a substrate and a face sheet bonded thereto. The apparatus has at least one air nozzle arranged to direct high velocity air in a direction generally radially outward of the circular pattern at a shallow angle to the face sheet of the laminate. A detection plate on the examining surface of the device is encircled by the air nozzles. The detection plate has associated therewith means for detecting when the face sheet of the laminate is deflected toward the detection plate, indicating that the laminate is not bonded to the substrate in that area. High pressure air is introduced through the air nozzles thereby producing an air cushion between the examining surface of the apparatus and the face sheet of the laminate and simultaneously producing a vacuum in the area between the detection plate and the face sheet, whereby the face sheet will be deflected toward the detection plate in an area where the face sheet is not bonded to the substrate.

Abstract: A pressure tester for pipes including a frame supporting a pair of threaded pipe attachments which can be threaded to the threaded ends of a pipe and are provided with means for injecting liquid under pressure to ascertain the integrity of the pipe under pressure. One of the pipe attachments is axially and pivotally movable relative to the frame and another is vertically and pivotally movable relative to the frame. A tilt elevator can raise one end to tilt the pipe during the filling operation. A vent valve is provided to exhaust air from the pipe so that it can be completely filled with water. Other pipe handling components are also described.

Abstract: A fitting for mounting to the ends of smooth wall tubes, particularly, expanded end tubes and beaded or barbed end tubes. The fitting grips behind the expansion or beaded end on the tube and seals on the tube outer diameter. The fitting also has a pressure assist design that furnishes increased sealing and gripping action with increase in sealing pressure.

Abstract: Disclosed is an airtightness testing apparatus for watches which is constructed as follows. A support block and a guide member having a seat to carry a watch to be examined are attached to a post at a vertical space from each other, the post being set up inside an airtight container which is pressurized or decompressed. A light emitting element and a light receiving element are embedded in the support block so as to face each other with a vertical gap inbetween. Inside a cavity adjoining the gap in the block, there are a screening plate vertically projected in the gap and a contact member solidly fixed to the plate.

Abstract: A probe for measuring the characteristics of soil, rock and the like surrounding a bore hole. The probe includes a hollow cylindrical body surrounded by a resilient membrane. The ends of the membrane are clamped to the cylindrical body, and a pressurized fluid is injected into the cylindrical body to expand the membrane until it contacts the walls of the bore hole. Feeler members which are resiliently biased in a radially outward direction contact a relatively large area of the membrane so that the outward movements of the feeler members are a function of the outward expansion of the membrane. The feeler members are instrumented with strain gauges to measure the expansion of the membrane which, along with measurements of the fluid pressure producing the expansion, provides an indication of the stiffness and strength of the material surrounding the bore hole.

Abstract: There is provided an engine test method whereby the engine involved is started and the systems thereof are regulated so as to obtain steady running, whereupon, by controlling fuel feed, a running-in process is performed by repeatedly carrying out runup-rundown cycles. In every running-in cycle, beginning with the first one, at least one of the parameters, for example, the acceleration of rundown, is measured and analyzed for the purpose of assessing the technical condition of the engine on which basis the parameters of the next running-in cycle are selected, the running-in process being ended at the instant when the engine reaches the predetermined technical condition.

Abstract: A method and apparatus for monitoring conditions in a fluid flow path so that the composition and operation of the flow path can be determined is disclosed. The apparatus includes a fluid flow detector, such as a gas flow logging tool, which detects the velocity at which a fluid, such as a gas, flows along the fluid flow path, such as a gas injection conduit used in a gas lift program for extracting oil from a well. The monitoring apparatus also includes a pressure detector and a temperature detector. Each of these detectors provides a respective electrical signal to a recorder unit, such as a strip chart recorder, for creation thereby of respective logs. The logs generated by the recorder unit permit qualitative and quantitative analyses of identifiable fluid flow path phenomena, such as the locations of valves and the volumetric flow of the fluid, to be made.

Abstract: The flow rate is determined from the heat transferred from an electrically heated wire stretched in a fluid flow to the fluid. The wire is placed not on a plane normal to the flow but within a section of the fluid passage bounded by two spaced planes normal to the flow. Preferably the wire is composed of series of line segments which are distributed evenly not only around the central axis of the passage but also in the direction of the flow so that the heat release from the wire in its entirety corresponds to the mean value of fluid velocities at various points.

Abstract: A liquid-level gauge includes an indicator for indicating an amount of fuel corresponding to a liquid level of the fuel detected by a liquid level detector mounted within a fuel tank of a vehicle. The indicator used is of the leaving pointer type in which a pointer keeps pointing a value immediately before a power supply is shut off. The energization of the indicator continues for a given time enough to complete the pointing operation when a power source switch has been turned on and then is interrupted intermittently.

Abstract: A humidity detecting resistor porcelain element, with at least one portion of an electrode being made of a resistance heating unit and the electrode serving for the resistance heating unit and humidity detecting element, and a humidity detecting apparatus using the humidity detecting resistor porcelain element. The heating and cleaning operations of the humidity detecting resistor porcelain can be uniformly and efficiently performed, thus ensuring the stable humidity detection. Also, the circuit construction of the humidity detecting apparatus can be simplified. They can be provided for use in the detecting and controlling operations of the various humidities.

Abstract: This invention relates to a speed indicating apparatus for a vehicle comprising a plurality of indicator lights and a speed counter, each said indicator lights mounted externally on the rear frame of the vehicle being connected to said speed counter by means of electric wires respectively and said speed counter being connected with a speedometer of the vehicle by means of a soft steel shaft which is in turn connected with gears of a speed change gear of the vehicle so as to transmit the rotating speed thereof to said speedometer and speed counter.

Abstract: A sound source located inside a tube having one end inside the mouth or nose of a subject provides an acoustic transient signal that propagates into the respiratory system of the subject to provide reflections sensed by a single mircophone inside the tube between the sound source and the mouth of the subject for recording on a transient recorder or computer and display on an oscilloscope after passing through a low pass filter to provide an output signal representative of the acoustical properties of the airways of the subject. This output signal may be processed in accordance with the deconvolution integral and other algorithms to determine essentially the acoustic impulse response, impedance or effective cross-sectional area of the airways, typically as a function of the distance from a reference point, such as the end of the tube.