This is the Copper version of these characters with specialized deep-sea helmets with that copper element ... of accessories and includes tools and diving suits." ...

I inherited this diving helmet from my grandfather. It was made for admiralty during WW1 by Siebe Gorman, submarine engineers. It is made of copper and brass and would have been used with a two ...

He mastered his grandfather's techniques - sheering an oval shape from a sheet of copper, pounding it with a wooden mallet ... Toth could not bring himself to make another diving helmet for four years ...

The apparatus included a copper helmet that had a long leather ... They both converted it to a diving helmet in about 1827 after they made numerous test dives with the smoke bell.