The progressive reduction of the size of the Campanas and the possibility of feeding them with pneumatic pumps or compressors from the surface, gave rise to the appearance of the helmets that are part of the scan. practice diving was getting much easier.
In 1819, the German engineer Augustus Siebe invented a helmet fixed to a jacket and fed with a pneumatic pump from the surface. Its discovery of an antirretrocesis valve allowed the air that was pumped into the helmet, did not return through the same duct. The exhaled air came out the bottom of the jacket, so it was essential that the diver was at all times in an upright position (for what was weighed in the chest and back, with the consequent danger of flooding in case of leaning). As of 1837, the SIEBAN-GORMAN DIVERSE MATERIAL COMPANY IS CREATED, ASSOCIATED WITH THE latter, an important German businessman of his time.
The equipment is perfected using a complete suit that adapts, perfectly hermetic, the helmet, which has several windows in front and the sides, for a better observation. In addition, heavy lead shoes are used to improve verticality. Some men descended with this type of equipment 100 meters deep. From this moment on, the accidents of Decompression They often succeeded among the classic divers.
With a classic diver and the underwater camera that he himself invented, theFrench Louis Boutan made, in 1893, the first photographs of the underwater world. Seven years later, along with his brother Antoine Boutan, they designed a steel bottle that supplied air to the classic copper helmet at a pressure of 200 kg/cm2.
