NOW that helium is exclusively used in the airships of the United States, whilst its employment in the craft of other Powers has been visualised by Dr. Eckener, it is interesting to examine the history, properties, occurrence, origin, extraction and practical utility of this most remarkable gas, whose discovery is both a romance and a defence, should it be required, of scientific as opposed to industrial research.
Teed, M.P.L. (1930), "A Review of the Helium Question: A Comprehensive Survey of its Properties, Sources of Supply and Possibilities for Use in Airships", Aircraft Engineering and Aerospace Technology, Vol. 2 No. 9, pp. 234-241. https://doi.org/10.1108/eb029314Download as .RIS
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