A nomogram is a diagram that solves a specific equation by means of adding one or more lines. Here’s an example:
The above diagram represents solving the equation where and .
I bring this up because the blog Dead Reckonings has posted a new full-length article on nomography, with a fantastic new quadratic-solving diagram on page 34. Here’s a shrunk-down version of the original:
If you want the larger version, go to the article.