File:Notices of the proceedings at the meetings of the members of the Royal Institution of Great Britain with abstracts of the discourses (1902) (14596986908).jpg

Identifier: noticesofproceed1719roya (find matches)
Title: Notices of the proceedings at the meetings of the members of the Royal Institution of Great Britain with abstracts of the discourses
Year: 1851 (1850s)
Authors: Royal Institution of Great Britain
Subjects:
Publisher: London : William Clowes and Sons
Contributing Library: University of Illinois Urbana-Champaign
Digitizing Sponsor: University of Illinois Urbana-Champaign

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condensed gas is left at C. Theexternal supply of liquid air from B being shut off and the stopcock Aclosed, the valve b connected with the tube d coming from the interiorvessel F is opened. This discharges all the air which was liquefieddirectly to the outside of F ; thereby diminishing the amount requiredto be supplied from the vessel B for the next operation of filling F,and the float E falls to the bottom of the vessel. During this empty-ing of the vessel the separated gas expands and fills the whole of Funder the given conditions of temperature and pressure. Care istaken, however, to leave a layer of liquid air below the float to guardagainst the gaseous contents in F being taken away in part by the air-pump. The valve b is now shut again and A opened so that the opera-tion of filling may be repeated, and after five or six sequences of thiskind the accumulated gas in F is drawn off into a mercury receiver G.The total volume of gas collected in this way amounted to about PLATE ! 6
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1902.) on Problems of the Atmosphere. 225 35^00th of the volume of the air directly liquefied, and contained 38per cent, of nitrogen, 4 per cent, of hydrogen, and 58 per cent, of mixedhelium and neon. On the average some 25 cc. of gas was collectedfor every litre of liquid air produced, and as the apparatus worksalmost automatically, the method becomes a practical one for theseparation of the most incondensable constituents of the atmosphere.After the removal of the hydrogen and nitrogen by sparking in theusual way with excess of oxygen over alkali, the helium and neoncan be separated. This is easily done by freezing out the neon bypassing the gaseous mixture through a tube cooled in liquid hydro-gen ; or the alternative method of spectroscopic fractionation describedin a former lecture may be adopted to effect the general separationof all the constituents. The execution of the process on the largerscale will enable gases other than helium and neon to be detected andultimately separat

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