Abstract
DURING the course of some work involving the handling of an easily adsorbed gas (ammonia) a number of taps and valves were tried and it was observed that all devices which incorporated greases, plastics or rubber were unsatisfactory owing to the large amount of gas adsorbed by these substances. It was a requirement that the valve for controlling the flow of gas should be vacuum-tight, withstanding a pressure difference between atmospheric pressure and 10−3 mm. mercury, have a minimal hold-up of gas and be small and suitable for attachment to a portable piece of apparatus.
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BLOCK, H. A Small Mercury Cut-off withstanding Large Pressure Differences. Nature 178, 1307–1308 (1956). https://doi.org/10.1038/1781307b0
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DOI: https://doi.org/10.1038/1781307b0
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