PAUL D STEWART / SCIENCE PHOTO LIBRARY PAUL D STEWART / SCIENCE PHOTO LIBRARY
Diver using bladder to breathe. Woodcut with later tinting from De Re Militari Libri Quator by Vegetalius, printed in 1532 by Christian Wechel from sources reaching back to the Roman original of 390AD. This is a very rare example of medieval woodcut using line shading to represent underwater - an innovation of this book. The fact that various bladders and tubes were used in during military exploits underwater is a suprise to many.
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