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| Keywords: Tondo e quadro detail (Bianco, 1436).jpg en Detail from the tondo e quadro circle and square of the 1436 atlas of Venetian cartographer Andrea Bianco Detail shows the upper-left corner of the square grid There is a distance bar scale with two different scales The top bar with tiny dots measures a unit of the square grid at 20 miles each dot is 1 mile The bottom bar with lines measures a unit of the square grid at 100 miles each vertical red line is 10 miles Bianco notes that by using the 20m-per-unit scale the 8 x 8 grid quadro will have a total length of 160 miles Notice also that Bianco has sixteen rays emanating from the corner implying he is using half-quarter winds eighth winds otava 5 625 degrees The 1436 Atlas is 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 2011-07-21 19 32 UTC Andrea Bianco derivative work Walrasiad <span class signature-talk >talk</span> Tondo_e_quadro_ Bianco _1436 jpg PD-old Original upload log This image is a derivative work of the following images File Tondo e quadro Bianco 1436 jpg licensed with Cc-pd-mark-footer PD-old Uploaded with derivativeFX Andrea Bianco Toleta de marteloio | ||||
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