Alpha and Beta Calutrons

Contemporary photographs of alpha and beta Calutrons at Oak Ridge.

A Conversation with Fred W. McLafferty

The Oral History Project of the Department of Chemistry and Chemical Biology at Cornell University has a 90 minute streaming video interview of mass spectrometry pioneer Fred McLafferty (Apple Quicktime required).

Rays of Positive Electricity and Their Application to Chemical Analyses

Google Books has a digitized and searchable versions of J. J. Thomson's Rays of Positive Electricity and Their Application to Chemical Analyses both the 1913 Edition as well as the 1921 Edition. There are also downloadable PDFs of the books.

Nier's Mass Spectrograph

Several photos of the 1940 Nier Mass Spectrograph are online at the National Museum of American History. Alfred Nier built this instrument to separate ²³⁵U from ²³⁸U and test the prediction that the former undergoes fission (via).

Calutron Operator's Story

The Calutron operator in the right foreground of the famous photograph tells her story.