Abstract
IT is suggested in NATURE of June 10 (p. 970) that the weight of this apparatus may possibly be still further, reduced “by mechanical improvement of valves and cylinders"; and as weight reduction is so important, the question is worth considering. The first Vibrac (not Vibrax, as on p. 961) bottles ever made were used for the 33lb., 1,600 litre, 1924 apparatus. The weight of steel was thus reduced almost exactly from 4¼ to 3½ times the weight of oxygen, the former figure applying to the first, or 1922, apparatus. Subtracting 19 lb., given in Mr. Peter Lloyd's article as charged bottle weight for the latest 1,000 litre apparatus, from the total weight of 25 lb., we get 6 lb. as the rough weight of the rest of the gear. This compares with 8 lb. in 1924, when the flow meter was not omitted.
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UNNA, P. Open Type Oxygen Apparatus. Nature 144, 114 (1939). https://doi.org/10.1038/144114a0
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DOI: https://doi.org/10.1038/144114a0
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