. The London, Edinburgh and Dublin philosophical magazine and journal of science. ow that the more violent discrepanciesfrom the predictions of Andrewss theory concerning thecritical phenomena have been due to causes which are notout of accordance with Andrewss theory. Owing to thepeculiar properties of the substance at the critical tempera-ture, the approach to conditions which permit of theoreticalresults must of necessity be asymptotic, and therefore toformulate an hypothesis for the purpose of explaining suchdiscrepancies as may now be considered to remain seems un-necessary, except perhap
. The London, Edinburgh and Dublin philosophical magazine and journal of science. ow that the more violent discrepanciesfrom the predictions of Andrewss theory concerning thecritical phenomena have been due to causes which are notout of accordance with Andrewss theory. Owing to thepeculiar properties of the substance at the critical tempera-ture, the approach to conditions which permit of theoreticalresults must of necessity be asymptotic, and therefore toformulate an hypothesis for the purpose of explaining suchdiscrepancies as may now be considered to remain seems un-necessary, except perhaps in the case of those liquids whosesurface-tensions point to association of their molecules Critical Phenomena of Ether. 825 Appendix. A Vapour Thermostat for work on Critical Phenomena. In connexion with the vapour jacket shown in fig. 3 anarrangement was employed for maintaining the vapour atconstant pressure, so that constant temperature was secured(fig. 8). The vapour jacket communicates, through a large ballonB, with the closed mercury manometer C. The manometer Ficr. is fitted with a Topler siphon-tube, so that the vacuum maybe tested and, if necessary, renewed. In the short arm ofthe manometer is a float E, which makes electrical contactwith a platinum-tipped needle F. The float consists of a lightPhil. Mag. S. 6. Vol. 20. No. 119. Nov. 1910. 3 I 826 Mr. F. B. Young on the copper disk to the top of which is cemented a piece of thin-walled glass tubing, constricted near the bottom. On thetop of the copper float is soldered a piece of platinum-foil ;the under surface is amalgamated. When contact is made,a rela}* Gr is actuated and a current of about 1 ampere is sentthrough a 5-ohm coil of fine german-silver wire H containedin the ballon B and lightly wrapped in cotton-wool. Theheat developed causes the air to expand until the consequentrise of pressure breaks the contact at E. If the temperatureof the ballon is already rather higher than that of the atmo-sphere, the p
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