Note: From Engineer Commodore Ture Zetterström, Acting Engineer General, RSN, and Surgeon Commodore Herbert Westermark, Surgeon General, RSN, we have received the following two papers on work done in the above field. The first paper was written by a son of Commodore Zetterström, Arne Zetterström, who lost his life when practising his own diving method. The second paper is written by two medical officers in the Swedish Navy who had the prerogative of being co-operators to Zetterström Jr. The two papers are accompanied by an obituary on the ingenious constructor Arne Zetterström. On account of their own worth and in order to honor the memory of the young constructor who died under so tragic circumstances, these papers are now for the first time laid before an American medical public.
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Arne ZetterstrÖm (1948) studied this question.