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