Abstract: Disclosed is a system for supplying high frequency alternating current to gas discharge lamps, such as fluorescent lamps, and the like and a unit that can be placed in or adjacent to a lighting fixture to convert a direct current supply into high frequency AC and also to provide the ballast needed for operation of the gas discharge lamps. A preferred inverter network includes a symmetrical, class B, push-pull current-limited, tuned-collector, sinusoidal oscillator which is self starting, highly efficient and stable over a wide range of input voltage, with or without load. Circuits are disclosed for dimming the lights, for supplying heating current to lamp filaments at high voltage at the start and much reduced voltage after the arc has been struck in the lamps served by the ballast unit, and this reduction in filament current takes place automatically without switches, resistors or other expensive and energy consuming means.

Abstract: The invention is both a system for supplying high frequency alternating current to gas discharge lamps, such as fluorescent lamps, and the like and a unit that can be placed in or adjacent to a lighting fixture to convert a direct current supply into high frequency AC and also provide the ballast needed for operation of the gas discharge lamps. This unit contains a symmetrical, class B, push-pull current-limited, tuned-collector, sinusoidal oscillator which is self starting, highly efficient and stable over a wide range of input voltage, with or without load. The number of parts is a minimum and the parts are relatively low cost, the power losses are very low and the system operates at high power factor with low acoustic and radio noise and low flicker.

Abstract: A circuit selector, particularly adapted for the control of stage lights and the like. A support frame carries a group of input buss bars that are individually connected to power sources through dimmer control devices. A load control switch corresponding to each connected buss bar is also mounted on the support frame. At least one load slider member is arranged to be repositioned and engaged with a selected one of the input buss bars while making electrical contact through a slide or guide rail for the slider member between a selected input buss bar and the corresponding load control switch. The slider member is yieldably actuated to a circuit making position and is positively latched in a retracted condition to freely move along the guide rail as it is positioned for engagement with a selected input buss bar.

Abstract: A solar heat storage and utility system wherein heat storage means is mechanically conveyed from an energy receptor area to a storage or other utility area. A series of enclosures containing heat storage media are intercoupled to and between endless connectors, such as sprocket chains, that are routed for heat absorption and also storage and/or use as required. The heat storage elements preferably take the form of tubes which are caused to rotate as they roll downwardly on their rails at the absorption area, thereby offering different sector surfaces to accomplish a rapid heating of the elements in which the heat storage media is contained. The system is self-contained in a primary or ancillary building enclosure. Means are provided to optimize energy reception and storage.

Abstract: The invention is both a system for supplying high frequency alternating current to gas discharge lamps, such as fluuorescent lamps, and the like and a unit that can be placed in or adjacent to a lighting fixture to convert a direct current supply into high frequency AC and also provide the ballast needed for operation of the gas discharge lamps. This unit contains a symmetrical, class B, push-pull current-limited, tuned-collector, sinusoidal oscillator which is self starting, highly efficient and stable over a wide range of input voltage, with or without load. The number of parts is a minimum and the parts are relatively low cost, the power losses are very low and the system operates at high power factor with low acoustic and radio noise and low flicker.