Word: nitrogen
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Dates: during 1920-1920
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...mask which could be used in submarines to protect men against carbon monoxide gas. Since last June he has been in charge of the research work of the nitrates division of the Ordnance Department, and in this position has been studying the task of putting the large nitrogen fixation plants in this country in such permanent shape that they can be used in times of peace and will be ready to turn out an adequate supply of nitric acid in case of another...