Labels:text | screenshot | font OCR: One interesting aspect of the codex is how Leonardo applies his observations of the world around him to practical, or even impractical, devices. While many pages include detailed designs and advice, here a number of quick comments reflect his wide-ranging scrutiny. Among his ideas for maintaining riverbanks, Leonardo describes how to extend the time a person can remain underwater beyond the duration of a natural breath. He proposes a simple snorkel for breathing underwater. This scientific invention raises a political and
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