|         |         | 
A graphical plot which can be used for solving certain types of equations.
References
Iyanaga, S. and Kawada, Y. (Eds.).  ``Nomograms.''  §282 in
  Encyclopedic Dictionary of Mathematics.  Cambridge, MA: MIT Press, pp. 891-893, 1980.
 
Menzel, D. (Ed.).  Fundamental Formulas of Physics, Vol. 1.  New York: Dover, p. 141, 1960.