Leonardo da Vinci self supporting bridge assembly

Most of the bridges drawn by Leonardo date to the first years after his arrival in Milan in 1482. The Self-Supporting Bridge is certainly the most ingenious for its constructive and structural simplicity. The greater the pressure on the upper part of the bridge, the greater its stability. ..
How to assemble Self supported bridge of Leonardo da Vinci
This model was not included in the main da Vinci video which is here:
https://www.youtube.com/watch?v=IxOagUqdibw
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Leonardo da Vinci self supporting bridge
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