d'Ocagne nomogram

d'Oc·ag·ne nom·o·gram

(dō-kan[h]'yĕ), an alignment chart consisting of an arrangement of three or more graduated lines (straight or curved), each constituting a scale of values of a variable, constructed so that any straight line crossing these scales connects the simultaneously compatible values; from values for any two variables, the values of all other variables can be determined.

d'Ocagne,

Philbert M., French mathematician, 1862-1938. d'Ocagne nomogram - an alignment chart.