Abstract: The flame temperature of a fluid fuel fired burner (10) is reduced by mixing flue gas (35) with the combustion air supply (34) before introduction of the fuel and combustion take place. The NOX produced by the process of combustion is thereby reduced. The flue gas (35) may also be induced from the furnace remote from the flame zone of the burner (10) such that the flame is not disturbed. A venturi (21) may be used to induce the flue gas (35) from the furnace.

Abstract: An underwater color television camera system for use in high pressure or dense shielding applications. The system includes a spread tube color television camera encased in a three-segment housing designed to provide quick access to and interchangeability of camera parts, while also providing protection to the camera from water pressure at depths of over 2500 feet below water surface. A television viewfinder is affixed to the camera housing for use during manual operation by divers. A control center which includes computer devices is remotely connected by coaxial or triaxial cable to the camera so as to permit surface control and monitoring of numerous camera operations. Camera operations and applications are capable of enhancement by use of computer generated graphics, computer navigation assistance, and computer aided visual communication with divers.