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This isn't so much a chart as a visual calculator (a nomograph or nomogram, as it says in the title). They were very common before computers/calculators, and encoded a fair amount of knowledge about their specific application areas and use cases.

Philip Bump@pbump.com

In case you were wondering if charts were genetic, here’s one my grandfather got published in 1946 when he was at Standard Oil.

27/6/26, 4:41 pm0 reposts0 likes

Philip Bump

@pbump.com

27 June

It is that. It is also a chart.

llimllib

@billmill.org

27 June

My wife still teaches medical students with a nomogram, and she wanted me to host a little calculator so I made her a single-serving site: pretest.page

pretest.pagePost-test Probability Calculator

Robert Kosara

@eagereyes.org

27 June

Nice! I've seen them used in medical and nursing contexts, like to show people their baby's weight and size relative to the population, etc.