At useR!, Jonty Rougier talked about nomograms, a once popular visualisation that has fallen by the wayside with the rise of computers. I’d seen a few before, but hadn’t understood how they worked or why you’d want to use them. Anyway, since that talk I’ve been digging around in biology books from the 60s and [...]
Nomograms
Paper hoarders will appreciate this nifty tool for cutting leftover pieces of paper into common size ratios like 4 by 3, Golden and Silver rectangles, or the ratio of the dollar bill.
In the late 1800s, a railway engineer named Philbert Maurice d’Ocagne was part of a group of men faced with the task of expanding the French rail system. Before a single rail could be laid, the int…
A Spanish-Dutch research group has created nomograms for PV system sizing that not only offer a standard calculation tool but also provide additional information about what-if scenarios with higher-level knowledge about price of modifications and limitations of project sites.
Second order equation solver
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Chart for calculating relevant acid-base values of the blood.
Modern circuit simulators can calculated such quantities at the blink of an eye
Nomography, truly a forgotten art, is the graphical representation of mathematical relationships or laws (the Greek word for law is nomos). These graphs are variously called nomograms (the term used here), nomographs, alignment charts, and abacs. This area of practical and theoretical mathematics was invented in 1880 by Philbert Maurice d'Ocagne (1862-1938) and used extensively…
