Keywords: Tondo e quadro (Bianco, 1436).jpg en The Tondo e quadro Circle and Square a visual measurement method of calculating trigonometric values for navigation from the first page of the ten-sheet atlas by Venetian cartographer Andrea Bianco dated 1436 Held by the Biblioteca nazionale Marciana Venice Atlante Bianco Biblioteca nazionale Marciana Venice http //geoweb venezia sbn it/geoweb/iscgi/archiweb dll service direct lang 0 uid 000004 session 000000 fld B value 029110 no Andrea Bianco 1436 Tondo e quadro detail Bianco 1436 jpg PD-old-100 Andrea Bianco Toleta de marteloio |