Diving bell with two divers on board, circa 1820. An improved version of Edmond Halley's diving bell, this hermetically sealed diving chamber was supplied by air through a copper pipe from the surface. Handcoloured copperplate engraving from Friedrich Johann Bertuch's Bilderbuch fur Kinder (Picture Book for Children), Weimar, 1823.
Diving bell with two divers on board, circa 1820. An improved version of Edmond Halley's diving bell, this hermetically sealed diving chamber was supplied by air through a copper pipe from the surface. Handcoloured copperplate engraving from Friedrich Johann Bertuch's Bilderbuch fur Kinder (Picture Book for Children), Weimar, 1823.