Same as nomogram.

A chart relating three or more scales across which a straightedge can be placed to provide a graphical solution for a particular problem.

a chart that presents an equation containing a number of variables in the form of several straight lines. The straight lines are scaled with values of the variables. To use it, a straight edge is placed across the scaled lines at the appropriate values. A nomograph can be easier to use than solving the equation.

a graphic representation of numerical relations

For calculating the effect of a filter on color temperature.