Abstract: A method and system for determining fuel delivery frequency and volume for a combustion system is provided. A delivery history of fuel deliveries to a fuel combustion system fuel storage tank is collected. The heating degree days for each time period between deliveries is ascertained. The volume of fuel used per day between each delivery is then calculated. A relationship is then established between volume of fuel used per day and heating degree days per day, for the plurality of fuel deliveries for the combustion system. Desirably the relationship is established by plotting the volume used per day vs. heating degree days per day for the combustion system. A desired volume of fuel for the next delivery is chosen. The number of elapsed days from the last delivery and the elapsed number of heating degree days per day are tracked. Periodically, the expected fuel use is calculated using the relationship.

Abstract: In a stationary electromagnet creating a multipole-nuclei dipole field for controlling the rotation around its axis of a movable element housing a permanent magnet, each of the electromagnet poles is shaped in the form of a circular arc having a corresponding opening angle from about 40 to about 110 degrees. Also the permanent magnet poles have faces shaped in the form of a circular arc, and in a preferred embodiment the permanent magnet is provided with grooves on both the pole faces, said grooves being parallel to the permanent magnet rotation axis.

Abstract: A method and apparatus for displaying the graphic and alphanumeric data of the type utilizing pixel matrix panels with an outside light source. The method comprises reflecting the outside light on a preselected colored surface, rotatably housed within each matrix pixel.Every pixel comprises a cylindrical container (1) having a transparent non-flat cap (3) at one of bases, the other base being missing. The container (1) houses a radiation deflector (5) and a hollow cylinder (7) having two or more reflecting areas (10), differently colored, located on its lateral surface (9).An external light radiation enters the container through the cap (3), is deflected by the deflector (5) and is reflected by one of the reflecting areas to be again deflected and directed to the outside.The hollow cylinder (7) is operated by an electromagnetic control so as to alternatively present to the deflected radiation a preselected colored area.