La Maniere universelle de Mr. Girard Desargues ..., pour poser l'essieu, & placer les heures & autres choses aux cadrans au soleil
A 1643 French treatise by Girard Desargues, engraved with Abraham Bosse, published in Paris by Des-Hayes, explaining a universal method for setting the gnomon and laying out hour lines on sundials for a general readership of craftsmen and instrument makers. The plates show geometric diagrams of sundial construction: angled gnomon rods on pivoting bases, radiating hour lines marked with Roman numerals, circular dials, and compass-and-arc layouts with lettered points, drawn in fine black line on cream paper, offering a designer clean technical diagram vocabulary for precise radial and scientific schematic layouts.
