Hottel's Crossed String Rule
The crossed string rule allows calculation of radiation transfer between opposite sides of a quadrilateral, and furthermore applies in some cases where there is partial obstruction between the objects. For a derivation and further details, see this article by G H Derrick.
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Famous quotes containing the words crossed, string and/or rule:
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—Oscar Wilde (1854–1900)
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gently, gently, sleeves and waxy bows.”
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—John Ashbery (b. 1927)