Northill Air Lung Fourth Field Test (Navy Experimental Diving Unit Report ER-8-57)

摘要

This report covers the evaluation of the Northill Air-Lung Regulator to determine the suitability of the apparatus for use in the Naval Service to depths of 200 feet at work rates equivalent to 0.85 knot swimming. For the description of the demand regulator in detail, see Evaluation Report 3-57. The regulator was tested objectively by breathing machine runs and subjectively by depth swimming runs, with instrumentation for respiratory pressure, respiratory minute volume, and breathing rate. Subjective swimming pool tests covered in Evaluation Report 3-57 were not repeated here. Breathing machine runs are summarized as recording tape excerpts of peak respiratory pressure versus depth and cylinder pressure. The subjective depth swimming runs are summarized as graphs of peak respiratory pressure, respiratory minute volume, and respiratory rate against time, cylinder pressure, and depth. The results are discussed constructively and lead to specific conclusions about the apparatus and its suitability for use in the Naval Service.