# Nomogram

From Glossary of Meteorology

## 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.