Title: Erasable magnetic diagramming panel

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Abstract: To permit easy changes in a diagram made over an overlay on a vertically-mountable panel, the panel includes a ferromagnetic backing material and a transparent nonmagnetic front panel spaced a predetermined distance from the back panel to receive movable magnetic symbol pieces with a fixed diagram between them. The size of the magnetic pieces and the spacing between the ferromagnetic back panel and the nonmagnetic front panel is such that the pieces may be lifted a slight distance from the back panel by moving a magnet that slides along the front panel and moved from place to place and yet, when the moving magnet is pulled free, the magnetic attraction to the ferromagnetic backing and the distances are such that the symbol is pulled back against the ferromagnetic back panel and is held in place against gravity. The transparent nonmagnetic front surface is flat, relatively firm and impermeable to moisture so that it may be marked upon and erased.


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