Difference between revisions of "Cut Screen (G.B.)"
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An opaque screen so placed as to provide a sharp cut-off to a beam in a sector light, and to reduce the angle of uncertainty (2-5-230). | An opaque screen so placed as to provide a sharp cut-off to a beam in a sector light, and to reduce the angle of uncertainty (2-5-230). | ||
[[Image:Ch2_Fig38.jpg|400px]] | [[Image:Ch2_Fig38.jpg|400px|border]] | ||
Revision as of 10:01, 1 March 2009
2-4-125
Alternative term: Sector Screen (U.S.A.)
An opaque screen so placed as to provide a sharp cut-off to a beam in a sector light, and to reduce the angle of uncertainty (2-5-230).
Note: In French the term Cache is used when the device is located at the optic; and the term Ecran is used when the device is located at any other position, e.g. at the lantern or outside it.
Please note that this is the term as it stands in the original IALA Dictionary edition (1970-1989)
