[1] In 1823 he patented a "Smoke Helmet" to be used by firemen in smoke-filled areas; the full title is given as "Apparatus or Machines to be worn by Persons entering Rooms or other places filled with Smoke of other Vapour, for the purpose of extinguishing Fire, or extricating Persons or Property therein".
A long leather hose attached to the rear of the helmet was to be used to supply air, the original concept being that it would be pumped using a double bellows.
Charles had insufficient funds to build the equipment himself, so sold his patent to his employer, Edward Barnard.
In 1829 the Deane brothers sailed from Whitstable for trials of their new underwater apparatus, establishing the diving industry in the town.
In 1834 Charles used his diving helmet and suit in a successful attempt upon the wreck of Royal George at Spithead, during which he recovered 28 of the ship's cannon.