Abstract: A humidifier (10) used in respiratory therapy is disclosed where the surface tension of a light probe (32) used therewith is maintained greater than the surface tension of the aqueous liquid used in the humidifier (10). Maintaining the surface tension of the light probe (32) greater than the surface tension of the aqueous liquid generally avoids erroneous indication of aqueous liquid level in the humidifier (10). Erroneous indications of liquid level can be caused by gas bubbles adhering to submerged portions of the light probe (32) or liquid droplets adhering to unsubmerged portions of the light probe (32).

Abstract: A carbureting type fuel metering apparatus has a primary and secondary induction passage into which fuel is fed by several fuel metering systems among which are primary and secondary main fuel metering systems and an idle fuel metering system, as generally known in the art; engine exhaust gas analyzing means sensitive to selected constituents of such exhaust gas creates a feedback signal which through an associated solenoid transducer becomes effective for controllably modulating the metering characteristics of the main fuel metering system systems, and, if desired, the idle fuel metering system as to thereby achieve the then desired optimum metering function; the solenoid transducer is shown as simultaneously controlling two valving members and is effective upon experiencing a failure to assume a position providing for a lean fuel mode of engine operation.

Abstract: Method and apparatus for mixing a gaseous oxidant (e.g., oxygen) and a lixiviant (e.g., an aqueous carbonate solution) at a downhole location in a well before the oxygen-saturated lixiviant is injected into a formation to be leached. The invention involves establishing a mixing zone in the well by positioning an orifice plate in the well at the downhole location. Lixiviant as it is flowed down the well passes through a restrictive opening in the plate causing a substantial increase in the flow velocity of the lixiviant. At the same time, gaseous oxidant is supplied to a point adjacent the opening in the plate and due to the increased velocity of the lixiviant flowing through the orifice, the oxidant is trapped to form a gas pocket below the orifice. Lixiviant flows through the gas pocket and becomes saturated with the gaseous oxidant.

Abstract: A carbureting type fuel metering apparatus has an induction passage into which fuel is fed by several fuel metering systems among which are a main fuel metering system and an idle fuel metering system, as generally known in the art; engine exhaust gas analyzing means sensitive to selected constituents of such exhaust gas creates feedback signal means which through an associated solenoid transducer become effective for controllably modulating the metering characteristics of the main fuel metering system, and, if desired, the idle fuel metering system as to thereby achieve the then desired optimum metering function; the solenoid transducer is shown as simultaneously controlling two valving members and is effective upon experiencing a failure to assume a position providing for a lean fuel mode of engine operation.

Abstract: A chlorine generator is disclosed as including an assembly for an electrolytic cell generating the chlorine and a separate assembly for feeding the chlorine gas into a body of water. The cell assembly preferably includes two separate electrolytic solutions separated by an ion permeable membrane, such that an anode and a cathode are positioned on each side of the membrane. The gas feed assembly is in fluid communication with the cell housing by two separate conduits which accomodate the flow of gas from the cell to the feed assembly, within which the gases are accumulated and intermixed with a portion of water which has been diverted from the main body of water to flow through the feed assembly and then back to the main body of water.This is a division of application Ser. No. 025,291, filed Mar. 30, 1979.

Abstract: A water vapor supply unit having a partition dividing a water tank into two compartments above a water line but allowing communication below the water line. A water level control in one compartment maintains the water level in both. One or more air inlet nozzles for each compartment are provided and are of angular form. They are side wall mounted for adjustment for regulation purposes. Each compartment has one or more vapor outlet fittings. A mount for a water level controller assures its proper disposition when mounted in place.

Abstract: A method of discharging residues resulting from gasification of fuel in a chamber filled in a lower portion thereof with water and having a gas cushion at high pressure above the water level, in which the residues accumulating in the chamber are discharged through a sluicing container connected to the lower end of the chamber and conveyor means connected to the sluicing chamber.