Sciographia, or, The art of shadovves

plainly demonstrating, out of the sphere, how to project both great and small circles upon any plane whatsoever : with a new conceit of reflecting the sunne beames upon a diall, contrived on a plane, which the direct beames can never shine upon : together with the manner of cutting the five regular Platonicall bodies, and two other, the one of 12, the other of 30 rhombes, never discovered heretofore, also the finding of their declinations and reclinations and adorning them with variety of dials : all performed by the doctrine of triangles, and for ease and delight sake by helpe of ... logarithmes