Franz Kessler drew plans for a new dive bell in 1616. An improvement was that glass ports were added to allow the diver to see. Another feature is that the bell seemed untethered. However, this bell was never used and lives only as a design.
Franz Kessler drew plans for a new dive bell in 1616. An improvement was that glass ports were added to allow the diver to see. Another feature is that the bell seemed untethered. However, this bell was never used and lives only as a design.