Nobel Media AB
The Nobel Prize: Lord Rayleigh Nobel Lecture
At this site from The Nobel Foundation you can download and read Lord Rayleigh's Nobel Lecture, "The density of gases in the air and the discovery o argon" (in pdf format).
Nobel Media AB
The Nobel Prize: Lord Rayleigh Biographical
At this site from the Nobel e-Museum, you can read about the scientific work of Lord Rayleigh (1842-1919 CE). This article includes information on his education and experiments with light and sound waves.