Information from the following sources was used in the compilation of these webpages. We encourage you to consult these works to broaden your knowledge of Coolidge and his accomplishments.
William David Coolidge: Inventor, Physicist, Research Director: www.harvardsquarelibrary.org/unitarians/coolidge.html.
Lemelson Center, Inventor of the Week Archive: web.mit.edu/invent/iow/coolidge.html.
Teachnet ie, X-ray Tubes: www.teachnet.ie/dkeenahan/page17.html.
The Crookes Tube and Related Experiments: http://neon.chem.uidaho.edu/~honors/crookes.html.