The art of dialling : performed geometrically ... arthmetically ... instrumentally ...
A 1700 London treatise by William Leybourn, a mathematician, on sundial construction, printed by T. Braddyll for a general audience of instrument makers and students. The pictures are geometric diagrams of celestial circles, meridians and sun paths drawn as dotted and solid lines over a plain circle, with lettered points and no shading, so a designer can borrow their clean compass-and-rule linework and radiating construction structure.
