The Notebooks of Leonardo Da Vinci Complete


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of the East held in his geographical studies. He never once alludes  
to the discovery of America.  
I.  
ITALY.  
Canals in connection with the Arno (1001-1008).  
1
001.  
CANAL OF FLORENCE.  
Sluices should be made in the valley of la Chiana at Arezzo, so that  
when, in the summer, the Arno lacks water, the canal may not remain  
dry: and let this canal be 20 braccia wide at the bottom, and at the  
top 30, and 2 braccia deep, or 4, so that two of these braccia may  
flow to the mills and the meadows, which will benefit the country;  
and Prato, Pistoia and Pisa, as well as Florence, will gain two  
hundred thousand ducats a year, and will lend a hand and money to  
this useful work; and the Lucchese the same, for the lake of Sesto  
will be navigable; I shall direct it to Prato and Pistoia, and cut  
through Serravalle and make an issue into the lake; for there will  
be no need of locks or supports, which are not lasting and so will  
always be giving trouble in working at them and keeping them up.  
825  


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