Abstract
As is well known, the speed and simplicity of the mercury vapour condensation pump has led to its almost universal adoption in the production of extremely high vacua. It suffers from the disadvantage that, while it rapidly removes gases and vapours from the vessel to be exhausted, it does not remove mercury vapour. Consequently, it is necessary to freeze the mercury vapour in a trap between the pump and vessel to be exhausted, by immersing the trap in liquid air. The cost of making liquid air, the difficulty of getting it in certain laboratories, and, in some researches, the need for keeping the mercury trap in action for several weeks without a break, suggested the desirability of looking for some alternative method.
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HUGHES, A., POINDEXTER, F. A Substitute for a Liquid Air Trap for Mercury Vapour in Vacuum Systems. Nature 115, 979 (1925). https://doi.org/10.1038/115979a0
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DOI: https://doi.org/10.1038/115979a0
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