Chemistry and Teaching
His most notable work was in the discovery and development of the first industrial source of helium gas. In 1903 he was called on to analyze a natural gas from Dexter, Kansas, which would not burn unless continuously heated. In collaboration with David McFarland he discovered that the gas contained nearly 12% of helium. No helium in natural gas had been discovered prior to that time, although it had been found in 1894 that helium existed on the earth, and might be extracted in small quantities from the atmosphere and from minerals. Cady was a consultant when helium reserves were later found in Texas and Colorado.
In 1917 he was appointed consulting chemist to the U.S. Bureau of Mines upon the inauguration by the Bureau of experiments with regard to helium and during the World War I he did a large amount of analytical and research work, the results of which influenced the designs of the various helium plants which were constructed by the government. He also made valuable research into the limits of the inflammability of helium and hydrogen mixtures and carried out a number of experiments on the permeability of balloon fabric by helium. In 1933 he developed a process for using chimney gases in the manufacture of a refrigerant. In 1936 he developed an ingenious new method for the accurate measurement of gaseous densities by means of a modified Westphal balance. The invention made it possible for the determination of molecular weight of gases with a degree of speed and precision not approached by any other method.
Despite his achievements in research, teaching constituted Cady's real life work. His courses won nation-wide repute, and many of his former students attained eminence in scientific fields. He was co-author with Edgar Henry Summerfield Bailey of "A Laboratory Guide to the Study of Qualitative Analysis" (1901) and author of "The Principles of Inorganic Chemistry" (1912), and "General Chemistry" (1916).
He was a member of the American Association for the Advancement of Science, and the American Chemical Society. On June 5, 1900, he married Stella Cornelia Gallup, daughter of George Gallup. They had three children: Ruth Caroline, George Hamilton, and Helen Frances. He died in Lawrence, Kansas.
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