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The reason I'm curious is that I've found an ink drawing that appears to be an early conception sketch of the Bay Bridge design. Of course the next problem would be getting the sketch on this site ... something that appears to be above my abilities.
I have a copy of the sketch on my computer.
I searched "butterfly" and got 49 hits, this among them:
You may use my e-mail address to send me the item, in any form you choose, and I should be able to post it here.
http://www.history.com/news/students-us ... ice-bridge
Rood detects a similarity between Leonardo's early-sixteenth-century design and Wright's.
Da Vinci's elevation drawing immediately caught my eye, and recalled FLLWright's Butterfly Bridge for San Francisco Bay. Of course da Vinci's bridge was designed to be built of stone, whereas Wright's bridge was based on reinforced concrete, but still there are striking similarities.
To have also discovered that variations of the da Vinci design have recently been constructed ... in wood and in "ice", and that preliminary plans have been made to construct his Galata Bridge over the Golden Horn ... also suggests that under the right circumstances Wright's Butterfly Bridge might yet see the light of day. We can only hope that it doesn't take 500 years.
A letter now in the Topkapi Museum from da Vinci to the Sultan, translated into Arabic, suggests da Vinci also proposed a suspension bridge over the Bosporus!