Abstract: An illumination and viewing system and method for detecting leaks by observing material caused to fluoresce by being illuminated by a beam of ultraviolet light. The beam is concentrated by a parabolic reflector coated to maximize ultraviolet reflection, and then passed through a filter which reflects visible wavelengths while allowing transmission of ultraviolet and IR wavelengths. The fluorescing light is viewed through eyeglasses which block wavelengths just below the wavelengths of the emitted fluorescing light.

Abstract: A UV light utilizing an angled dichroic cold mirror reflector to selectively direct UV light out of a window on the side of the light housing while transmitting visible and infrared light out a window in the end of the housing to eliminate heat. The light may be used both as a flashlight and a black light for UV inspection. A removable cap can be placed over the end window to block visible light.

Abstract: A UV light utilizing an angled dichroic cold mirror reflector to selectively direct UV light out of a window on the side of the light housing while transmitting visible and infrared light out a window in the end of the housing to eliminate heat. The light may be used both as a flashlight and a black light for UV inspection. A removable cap can be placed over the end window to block visible light.

Abstract: A light source and method for leak detection in which a dichroic filter is used with a powerful lamp emitting UV radiation. The dichroic filter is coated with layers of either tantalum pentoxide or hafnium dioxide to transmit UV in the approximate range of 340-380 nm and infrared above about 700 nm, while reflecting all visible light and shorter wavelength UV radiation.

Abstract: A method and arrangement for supplying dye to a leak tester and injecting the dye into a sealed system by precharging a disposable plastic syringe with a sufficient volume of dye to conduct the leak testing. The precharged syringe is shipped to the tester who connects the syringe to a hose assembly having a check valve, and a Luer coupling adapter at one end and a Schrader at the other end, which is then connected to the system, and the syringe plunger advanced to inject the dye. An adjustable stop on the syringe plunger allows an accurately set portion of the total volume to be injected.

Abstract: A tool for applying drywall compound to a drywall joint is disclosed. The tool includes an application member of resilient flexible material. The member has a generally flat application surface and an arcuate application edge. The application edge and the thickness of the application member are selected for a central portion of the edge to be urged against a joint defined by contiguous flat drywall sheets. The application surface on opposite sides of the central portion flex to define a smooth continuous surface from the central portion to points on the drywall sheets spaced from the joint. The tool urges drywall compound within the joint to assume a smooth surface filling the joint and fanned away from the joint into smooth continuity with the drywall sheets.