Robuta

https://www.repository.cam.ac.uk/items/32b5e3f5-653c-4168-b817-fc1ac933ea6c Letter from William Gascoigne to William Oughtred. letter william gascoigne https://cy.wikipedia.org/wiki/William_Oughtred William Oughtred - Wicipedia william wicipedia https://books.google.com/books?id=Lt5EAAAAcAAJ&source=gbs_navlinks_s Elementi decimi Euclidis declaratio - William Oughtred - Google Books elementi declaratio william google books https://www.gutenberg.org/ebooks/46815 William Oughtred: A Great Seventeenth-Century Teacher of Mathematics by Cajori | Project Gutenberg Free eBook digitized and proofread by volunteers.