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: Niels Bohr Nobel Lecture: The Structure of the Atom
At this site from the Nobel e-Museum you can download and read Niels Bohr's Nobel Lecture, "The structure of the atom" (available in pdf format).