Abstract: A water control and diversion headgate for use in irrigation systems, simplifying the headgate construction, easing its operation and improving its overall efficiency. This headgate includes a corrugated pipe, sometimes provided with an internal liner and having a beveled slot which extends slightly less than halfway through its diameter. A solid, flat elongated water-blocking gate, usually somewhat flexible, is positioned within the slot for vertical movement and for fully or partially blocking water flow through the pipe. The gate has a tapered lower edge and is adapted to make a sealing line contact with an adjacent pipe corrugation for sealing efficiency.

Abstract: A method and apparatus for monitoring the concentration of a component of a gas stream. The gas stream to be monitored is heated to a desired temperature and passed through an insulated gas passageway of a conduit member. The heated gas passes sequentially through a perforate metal shield and a body of a particulate catalyst. The temperature of the heated gas entering and leaving the conduit member is monitored and any increase in temperature is correlatable with the component concentration in the gas stream. The method and apparatus are particularly suitable for monitoring the concentration of hydrogen or oxygen in a gas stream.

Abstract: An apparatus for thermally recombining gases comprising a first (heating) chamber in which the gases to be combined are initially heated to a temperature above the threshold for thermal combination or recombination, a second (reaction) chamber is formed to provide for mixing of previously reacted gases with the gases delivered from the first chamber, and a temperature control means responsive to the temperature in the second chamber for controlling the temperature to which the gases are initially heated in the first chamber.