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A typical panel would be cut to allow 1/4" (5 mm) between itself and the bottom of the groove in the frame. It is common to place some sort of elastic material in the groove between the edge of the panel and the frame before assembly. These items center the panel in the frame and absorb seasonal movement.
Float glass is a sheet of glass made by floating molten glass on a bed of molten metal of a low melting point, typically tin, [1] although lead was used for the process in the past. [2] This method gives the sheet uniform thickness and a very flat surface. [ 3 ]
A floating hinge is a hinge that, while able to behave as a normal hinge, enables one of the objects to move away from the other - hence "float". In effect, the hinge allows for two parallel axes of rotation – one for each object joined by the hinge – and each axis can be moved relative to the position of the other.