Abstract
A new type of slit mechanism is described which operates on the principle of the proving ring or loading ring. The load applied to distort a steel ring is the means by which the slit openings are varied and the opening determined. Very simple devices are described in which straight slit jaws are connected to opposite sides of a flexible ring and known weights are applied to the ring to obtain the desired slit opening. The mechanism has been used to provide very long dual curved slits for Ebert type monochromators, in which the proving ring itself acts as one jaw of the curved slits. The dual slits have been actuated by hydraulic pressure for vacuum operation.
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