Popular in medicine from about 1925 to 1975, a nomogram is a graphical means for solving an equation by placing a straightedge
across several scales. Today, most reported nomograms are inconsistent with established definitions and clinical use. Grimes
discusses nomograms, reviews their history as crude calculators, documents the current epidemic, gives examples of good and
bad medical nomograms, and recommends a better approach to contemporary medical calculations.