Nov 1932
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1932natur.130..739m&link_type=abstract
Nature, Volume 130, Issue 3289, pp. 739 (1932).
Physics
Scientific paper
THE interesting investigations of Messrs. Hughes and Poindexter1 showed that a trap lined with alkali metal is as satisfactory as a liquid air trap, for preventing mercury vapour diffusing back into a vacuum system from a mercury pump. This method offers several advantages, with one disadvantage: it is difficult to clean commercial alkali metals and to avoid the introduction of various impurities (for example, organic vapours, hydrogen, carbonic dioxide) in the vacuum system. However, there exists one method-the glass-electrolysis-which enables very clean sodium to be introduced into closed glass vessels. This elegant method can be easily applied to any normal glass or pyrex glass apparatus by providing the mercury trap with an incandescent cathode and immersing it partially in molten sodium salt. We have already used a similar method in the manufacture of photoelectric cells.2
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