A first course in nomography
A first course in nomography by Selig Brodetsky, published in London by G. Bell and Sons in 1920 as a university-level textbook on nomography, the mathematics of graphical calculation. The pictures are nomograms: parallel graduated scales with straight lines drawn across them to read off results, along with one curved scale diagram. A designer might take from them the clean rule-and-tick vocabulary of scales, reference lines and crossing guides as a model for technical diagrams and information graphics.
