The Notebooks of Leonardo Da Vinci Complete


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has 3500 braccia of descent, that is, one mile and 1/6; therefore it  
is higher than any mountains which exist in the West.  
[Footnote: The passage before this, in the original, treats of the  
exit of the waters from Lakes in general.]  
The Dardanelles.  
1
108.  
In the Bosphorus the Black Sea flows always into the Egean sea, and  
the Egean sea never flows into it. And this is because the Caspian,  
which is 400 miles to the East, with the rivers which pour into it,  
always flows through subterranean caves into this sea of Pontus; and  
the Don does the same as well as the Danube, so that the waters of  
Pontus are always higher than those of the Egean; for the higher  
always fall towards the lower, and never the lower towards the  
higher.  
Constantinople.  
1
109.  
The bridge of Pera at Constantinople, 40 braccia wide, 70 braccia  
high above the water, 600 braccia long; that is 400 over the sea and  
2
00 on the land, thus making its own abutments.  
891  


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