HYPERBARIC OXYGENTHERAPY 
ORIGENS

                Figure 1: Aristóles/Henshaw's Bell.
               
Demonstrative project of the bell of diving based on the concepts of Aristotle. In 1662, Henshaw described the bell of immersion with ventilation system the bellows.

                 Figure 2: Diving's Bell.
 
In the superior figure the chamber meets in the level of the sea, with chamber pressure of 1 atmosphere (ATM). In the inferior figure to notice that the 10 meters of depth it is necessary to increase the chamber pressure of 1 atmospheres.