By Professor Dr. med Albert A. Bühlmann (auth.)
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Sn. 0 (") -, 0 ;;! ) ~ ? 6 2 1 Compartment 6 5 4 3 Table 8. tol. t. bar Fig. 7. ZH-L12• Tolerated ambient pressure (P amb. ) dependent on the calculated pressure of inert gas in tissue (Pi. g. ) with half-value times for helium of 1-240 min. 65-114 min for nitrogen. The curve for the half-value times of 146-185 min for nitrogen coincides in "the air range" with that for the half-value times of 55-240 min for helium. 1 bar can be maintained. 5 bar). 86 bar). With the ZH-L12 system a continuous decompression can also be calculated without difficulty and a computer programmed for decompression calculations.
At the simulated altitude air was breathed and work was performed on the bicycle-ergometer during 10 min in each hour. In computing the "correct" decompression the value was again rounded, as mentioned in Table 8 (see Sect. 2). 16. 0bar. 5 bar. 0 bar for 60 min the ambient pressure is reduced for 120 min. 17. 5 bar for 65 min. 70 bar for 120 min. (See Tables 10 and 15) AA-120 briefly exceeded those of 79-114 min and that of 304 min. In both experiments, after the interval at the surface the ambient pressure was reduced significantly more than in correspondence with the half-value time for nitrogen of 304 min.
1961 EDU 15,0 . 20,0 I Gas 02 1 2 3 4 5 1,0 0,50 0,21 0,10 0,10 \_10min-• 5 I I I I I I 10 I I I I I I I I 50 40 30 20 I I I I I 70 60 I I I I I I I He N2 90 80 I Washington 0,50 0,79 0,30 100 110 I I I I I 0,60 0,90 120 130 140 I I I I I min Fig. 13. 0 bar. Course of compression and decompression normal pressure in 140 min. The experts were impressed, especially by the short and obviously well-tolerated decompression. 4 bar with a decompression lasting only 31 min. 13). The calculation of these dives with the ZHL12 system shows that the dives had essentially been in the safe range.