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H6 - Federal Item Name Directory
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22592
IRIS DIAPHRAGM,OPTICAL INSTRUMENT
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FIIG: T271-J
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Entry Date: Apr-01-1974
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Concept:
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Status: A
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Applicability: JE
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Type: 0
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Definition: An adjustable item of thin, overlapping opaque plates which are actuated by a ring or other device so as to change the diameter of a central opening, for controlling the intensity of transmitted illumination. It is usually employed to regulate the aperture of a lens in microscopes, and other optical instruments.
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Corresponding NIINs: 46
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