The Condensation of Helium

Abstract

I HAVE just read with great interest of Prof. Onnes's experiments with helium, and as one who has carried out investigations at very low temperatures, and to a certain extent in the same direction, I must congratulate him on having overcome difficulties of no ordinary nature. At the time of my departure for India I was engaged in an attempt to measure temperatures below the temperature of solid hydrogen, with the ultimate object of determining thermal constants for helium, but the work was broken off when I left Bristol, and it is not likely that I shall be able to resume it for some time. However, it is possible that brief information as to the method I intended to employ may be of use to others.