Nomogram

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nomogram

(Or alignment chart;
also called nomograph, nomographic chart.) The graphical representation of an equation of three variables f(u, v, w) = 0, by means of three graphical scales (not necessarily straight), arranged in such a manner that any straight line, called an index line, cuts the scales in values of u, v, and w satisfying the equation.

By introducing auxiliary variables and constructing auxiliary scales, equations containing more than three variables may also be represented by nomograms.

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