The whetstone of witte, whiche is the seconde parte of arithmetike: containyng thextraction of rootes: the cossike practise, with the rule of Equation: and the woorkes of surde nombers
A 1557 London algebra and arithmetic treatise by Robert Recorde, printed by J. Kyngstone, written as a teaching text for readers learning root extraction and equations. The pictures are woodcut diagrams of cubes divided into smaller cubes, and right triangles and rectangles labelled with side lengths and numbers, set among printed text. A designer could take from them the clean, schematic line drawing of nested grids and the labelled geometric figures.
