| Travers helped Ramsay to determine the properties of the newly discovered gases argon and helium. They also heated minerals and meteorites in the search for further gases, but found none. Then in 1898 they obtained a large
quantity of liquid air and subjected it to fractional distillation. Spectral analysis of the least volatile fraction revealed
the presence of krypton. They examined the argon fraction for a constituent of lower boiling point, and discovered neon. Finally xenon, occurring as an even less volatile companion to krypton, was identified spectroscopically. Travers continued his researches in cryogenics and made the first accurate temperature
measurements of liquid gases. He also helped to build several experimental liquid air plants in Europe.
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