The Notebooks of Leonardo Da Vinci Complete


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There is, in MS. W. L. 2l2b, a sketched plan of Florence, with the  
following names of gates:  
Nicholo--Saminiato--Giorgo--Ghanolini--Porta San Fredian  
--Prato--Faenza--Ghallo--Pinti--Giustitia.]  
1
005.  
The ruined wall is 640 braccia; 130 is the wall remaining with the  
mill; 300 braccia were broken in 4 years by Bisarno.  
1
006.  
They do not know why the Arno will never remain in a channel. It is  
because the rivers which flow into it deposit earth where they  
enter, and wear it away on the opposite side, bending the river in  
that direction. The Arno flows for 6 miles between la Caprona and  
Leghorn; and for 12 through the marshes, which extend 32 miles, and  
16 from La Caprona up the river, which makes 48; by the Arno from  
Florence beyond 16 miles; to Vico 16 miles, and the canal is 5; from  
Florence to Fucechio it is 40 miles by the river Arno.  
56 miles by the Arno from Florence to Vico; by the Pistoia canal it  
is 44 miles. Thus it is 12 miles shorter by the canal than by the  
Arno.  
828  


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