A graphical plot which can be used for solving certain types of equations. According to Steinhaus (1983, p. 301), the Nomogram was invented by the French mathematicians Massau and M. P. Ocagne in 1889.

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.

Steinhaus, H. Mathematical Snapshots, 3rd ed. New York: Dover, pp. 92-95 and 301, 1999.

Whittaker, E. T. and Robinson, G. "Nomography." §128 in The Calculus of Observations: A Treatise on Numerical Mathematics, 4th ed. New York: Dover, pp. 128-130, 1967.

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Weisstein, Eric W. "Nomogram." From MathWorld--A Wolfram Web Resource. http://mathworld.wolfram.com/Nomogram.html