Dialling, plain, concave, convex, projective, reflective, refractive. Shewing, how to make all such dials, and to adorn them with all useful furniture relating to the course of the sun; performed arithmetically, geometrically, instrumentally and mechanically: and illustrated with sculptures, engraven in copper, comprised in XIV distinct tractates...
A 1700 London treatise on sundials by the mathematician William Leybourn (1626-1716), printed by J. Matthews for A. and J. Churchill, setting out how to construct plain, concave, convex, projective, reflective and refractive dials. Its copper-engraved plates show geometric sun-path diagrams with lettered construction lines, and a designer could borrow their crisp line-drawn rays, arcs and labelled points for diagrammatic graphics.
