Abstract: A tool for carpentry that when used with a nail, a pencil, and a tape measure can draw circles and arcs from a radius of 1 inch up to that of the length of the tape measure. It can also easily make circles or arcs with a radius of 2 inches up to 12 inches using pencil guide holes that are staggered down the length of the device at one eighth-inch intervals. The tool has two rare earth magnets that hold the tape measure to the tool during use. The magnets can be used also to hold a nail on the tool for storage purposes. In that way, a nail is always available when a circle is needed. For more convenience, one or more bubble levels can be added to the tool making the tool not only a circle tool but a torpedo level as well.

Abstract: Heat storage and transfer system and method in which a liquid-solid phase change material and a liquid-vapor phase change material selected for coaction with each other are disposed in a container with a body of the liquid phase of the liquid-vapor material in continuous contact with a body of the liquid phase of the liquid-solid material for superior heat transfer between the materials for giving up and transferring sensible heat and liquid to solid phase change latent heat to vaporize liquid-vapor phase change material and vapor to liquid phase change latent heat to a condenser/heat exchanger and also for superior heat transfer from a heat source such as a solar or electric heater by giving up the heat of condensation of a vapor phase to a solid-liquid material which accepts the heat as sensible heat and as heat of melting.

Abstract: Closed heat transfer system including a body of water in a first container, a body of aluminum compound in a second container and a conduit connecting the containers, the system being operative in a first step to evaporate water from the first container to cool it by withdrawing heat of vaporization which is supplied to the water at relatively low temperature and to react the water vapor with the aluminum compound in the second container to generate heat at relatively high temperature and to combine with the water so that the water vapor pressure remains low and water continues to evaporate from the body of water for continued cooling, and the system operating in a second stage by supply of heat to the reaction products of the water and aluminum compound to restore the aluminum compound to its initial condition by driving off water which is condensed and returned to the body of water in the first container.