These are actually still pretty handy though I didn't know their name! I used them in a chemistry class where various partial pressures were calculated and the various axis were included for O2, H2, etc. Nomogram's are often quicker than even looking up similar information on a computer. It seems sometimes we've lost the ability to quickly and intuitively solve problems without resorting to a computer. These graphical methods allow you to estimate results in your head using even a rough visual memory of the graph.
The old Radio HAM book (70's edition) had a lot of it.
I really like this kind of graphs for analog electronic calculations. It make everything far faster. and you not need highly precise calculations as components have always tolerances and standardized values.
I first learned about Nomographs (that's what they were called there) in the Silent Hunter submarine simulations. The navigation map had one at the side to convert between time, distance and speed (know two of those, and quickly lookup the third value).
