Abstract: An embodiment of the invention provides a toy construction kit comprising a light element and a construction element. The light element comprises a housing having a first end and a second end, the housing defining a compartment, a magnet disposed in the compartment at the first end, and a printed circuit board disposed at the second end of the housing, the printed circuit board having an illumination device mounted on its side opposite to the compartment. The construction element is held to the light element by a magnetic attractive force between the magnet at the first end of the light element and the construction element.

Abstract: Magnetic structural components utilized to permit construction of a wide variety of structural profiles and to thereby increase design and/or construction flexibility and choice. The structural components each include a number of magnets operatively associated with a periphery thereof to provide a number of points of magnetic connection. In addition, each structural component has at least one mechanical connector operatively associated therewith to provide at least one point of mechanical connection. The structural components can be magnetically and/or mechanically interconnected to form a variety of different two or three-dimensional structural profiles of varying complexities.

Abstract: A movable magnetic construction kit that is suitable for creating a variety of different construction profiles and including at least one primary connecting element that can be operatively associated with one or more secondary connecting elements via magnetic and/or mechanical connections. The primary connecting element has at least one aperture therein and a plurality of magnets operatively associated with an edge thereof. The primary connecting element in combination with the secondary connecting elements provides for a movable construction kit for enhanced construction and design capabilities.

Abstract: A photographic processing drum includes a trough coaxially arranged within and spaced apart from the interior surface of the drum. A cap sealingly fitted to one end of the drum includes separate channels, isolated from each other, for conducting fluids into and out of the drum. Fluids introduced into the inlet channel are emptied directly into the trough without first contacting the interior surface of the drum. A method for employing the photographic drum in the processing of light-sensitive emulsions is also discussed.