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File:Tondo e quadro detail (Bianco, 1436).jpg

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English: 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.
Date (UTC)
Source Atlante Bianco, Biblioteca nazionale Marciana, Venice (no.)
Author

Andrea Bianco


This is a retouched picture, which means that it has been digitally altered from its original version. The original can be viewed here: Tondo e quadro (Bianco, 1436).jpg: .


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Date/TimeThumbnailDimensionsUserComment
current19:45, 21 July 2011Thumbnail for version as of 19:45, 21 July 20111,090 × 722 (326 KB)WalrasiadWrong file before.
19:43, 21 July 2011Thumbnail for version as of 19:43, 21 July 2011529 × 201 (31 KB)Walrasiad{{Information |Description={{en|1=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

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