Second Preliminary Report on Nitrogen Oxygen Self-Contained Underwater Breathing Apparatus,

摘要

The report covers an additional investigation into the characteristics and potentialities of the nitrogen-oxygen self-contained underwater breathing apparatus when used under swimming conditions or for extremely heavy work. The original investigation drew the general conclusion that the apparatus is satisfactory as a diving outfit. This evaluation revelas the limitation which develops when the apparatus is used for swimming or heavy work at surface conditions:the unit can produce anoxia. As a result of this limitation,the following guides to use of the unit must be followed:Use straight oxygen in both bottles for swimming oy diving at depths down to 30feet;if using the air-oxygen mixture for light diving down to 30feet,purge the bag completely after every five minutes of unforeseen,sustained,heavy physical exertion;use the air-oxygen mixture for swimming or diving at depths greater than 30feet,and purge the bag completely before starting to the surface. (Author)